Merge tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

- hfs and hfsplus kmap API modernization (Fabio Francesco)

- make crash-kexec work properly when invoked from an NMI-time panic
(Valentin Schneider)

- ntfs bugfixes (Hawkins Jiawei)

- improve IPC msg scalability by replacing atomic_t's with percpu
counters (Jiebin Sun)

- nilfs2 cleanups (Minghao Chi)

- lots of other single patches all over the tree!

* tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (71 commits)
include/linux/entry-common.h: remove has_signal comment of arch_do_signal_or_restart() prototype
proc: test how it holds up with mapping'less process
mailmap: update Frank Rowand email address
ia64: mca: use strscpy() is more robust and safer
init/Kconfig: fix unmet direct dependencies
ia64: update config files
nilfs2: replace WARN_ONs by nilfs_error for checkpoint acquisition failure
fork: remove duplicate included header files
init/main.c: remove unnecessary (void*) conversions
proc: mark more files as permanent
nilfs2: remove the unneeded result variable
nilfs2: delete unnecessary checks before brelse()
checkpatch: warn for non-standard fixes tag style
usr/gen_init_cpio.c: remove unnecessary -1 values from int file
ipc/msg: mitigate the lock contention with percpu counter
percpu: add percpu_counter_add_local and percpu_counter_sub_local
fs/ocfs2: fix repeated words in comments
relay: use kvcalloc to alloc page array in relay_alloc_page_array
proc: make config PROC_CHILDREN depend on PROC_FS
fs: uninline inode_maybe_inc_iversion()
...

.mailmap

···
 Finn Thain <[e-mail]> <[e-mail]>
 Franck Bui-Huu <[e-mail]>
 Frank Rowand <[e-mail]> <[e-mail]>
+Frank Rowand <[e-mail]> <[e-mail]>
 Frank Rowand <[e-mail]> <[e-mail]>
 Frank Rowand <[e-mail]> <[e-mail]>
 Frank Zago <[e-mail]>

Documentation/admin-guide/sysctl/kernel.rst

···
 4 s3_beep
 = =======
 
+arch
+====
+
+The machine hardware name, the same output as ``uname -m``
+(e.g. ``x86_64`` or ``aarch64``).
 
 auto_msgmni
 ===========

Documentation/dev-tools/checkpatch.rst

···
 
     See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
 
+  **BAD_FIXES_TAG**
+    The Fixes: tag is malformed or does not follow the community conventions.
+    This can occur if the tag have been split into multiple lines (e.g., when
+    pasted in an email program with word wrapping enabled).
+
+    See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
+
 
 Comparison style
 ----------------

arch/alpha/configs/defconfig

···
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_ALPHA_LEGACY_START_ADDRESS=y
 CONFIG_MATHEMU=y
 CONFIG_CRYPTO_HMAC=y

arch/alpha/include/asm/processor.h

···
 
 /* Free all resources held by a thread. */
 struct task_struct;
-extern void release_thread(struct task_struct *);
-
 unsigned long __get_wchan(struct task_struct *p);
 
 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)

arch/alpha/kernel/process.c

···
 	current_thread_info()->pcb.unique = 0;
 }
 
-void
-release_thread(struct task_struct *dead_task)
-{
-}
-
 /*
  * Copy architecture-specific thread state
  */

arch/alpha/kernel/setup.c

···
 	   boot flags depending on the boot mode, we need some shorthand.
 	   This should do for installation.  */
 	if (strcmp(COMMAND_LINE, "INSTALL") == 0) {
-		strlcpy(command_line, "root=/dev/fd0 load_ramdisk=1", sizeof command_line);
+		strscpy(command_line, "root=/dev/fd0 load_ramdisk=1", sizeof(command_line));
 	} else {
-		strlcpy(command_line, COMMAND_LINE, sizeof command_line);
+		strscpy(command_line, COMMAND_LINE, sizeof(command_line));
 	}
 	strcpy(boot_command_line, command_line);
 	*cmdline_p = command_line;

arch/arc/configs/tb10x_defconfig

···
 CONFIG_CONFIGFS_FS=y
 # CONFIG_MISC_FILESYSTEMS is not set
 # CONFIG_NETWORK_FILESYSTEMS is not set
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_DEBUG_FS=y
 CONFIG_HEADERS_INSTALL=y

arch/arc/include/asm/processor.h

···
 #define task_pt_regs(p) \
 	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
 
-/* Free all resources held by a thread */
-#define release_thread(thread) do { } while (0)
-
 /*
  * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
  * get optimised away by gcc

arch/arm/include/asm/processor.h

···
 /* Forward declaration, a strange C thing */
 struct task_struct;
 
-/* Free all resources held by a thread. */
-extern void release_thread(struct task_struct *);
-
 unsigned long __get_wchan(struct task_struct *p);
 
 #define task_pt_regs(p) \

arch/arm/kernel/process.c

···
 	thread_notify(THREAD_NOTIFY_FLUSH, thread);
 }
 
-void release_thread(struct task_struct *dead_task)
-{
-}
-
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
 int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)

arch/arm64/include/asm/processor.h

···
 /* Forward declaration, a strange C thing */
 struct task_struct;
 
-/* Free all resources held by a thread. */
-extern void release_thread(struct task_struct *);
-
 unsigned long __get_wchan(struct task_struct *p);
 
 void update_sctlr_el1(u64 sctlr);

arch/arm64/kernel/process.c

···
 	flush_tagged_addr_state();
 }
 
-void release_thread(struct task_struct *dead_task)
-{
-}
-
 void arch_release_task_struct(struct task_struct *tsk)
 {
 	fpsimd_release_task(tsk);

arch/csky/include/asm/processor.h

···
 /* Forward declaration, a strange C thing */
 struct task_struct;
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
 /* Prepare to copy thread state - unlazy all lazy status */
 #define prepare_to_copy(tsk)    do { } while (0)
 

arch/hexagon/include/asm/processor.h

···
 #define KSTK_EIP(tsk) (pt_elr(task_pt_regs(tsk)))
 #define KSTK_ESP(tsk) (pt_psp(task_pt_regs(tsk)))
 
-/*  Free all resources held by a thread; defined in process.c  */
-extern void release_thread(struct task_struct *dead_task);
-
-/* Get wait channel for task P.  */
 extern unsigned long __get_wchan(struct task_struct *p);
 
 /*  The following stuff is pretty HEXAGON specific.  */

arch/hexagon/kernel/process.c

···
 }
 
 /*
- * Release any architecture-specific resources locked by thread
- */
-void release_thread(struct task_struct *dead_task)
-{
-}
-
-/*
  * Some archs flush debug and FPU info here
  */
 void flush_thread(void)

arch/ia64/configs/bigsur_defconfig

···
 CONFIG_INET=y
 # CONFIG_IPV6 is not set
 CONFIG_BLK_DEV_LOOP=m
-CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
 CONFIG_BLK_DEV_RAM=m
 CONFIG_ATA=m
···
 CONFIG_NFSD=m
 CONFIG_NFSD_V4=y
 CONFIG_CIFS=m
-CONFIG_CIFS_STATS=y
 CONFIG_CIFS_XATTR=y
 CONFIG_CIFS_POSIX=y
 CONFIG_NLS_CODEPAGE_437=y

arch/ia64/configs/generic_defconfig

···
 CONFIG_CONNECTOR=y
 # CONFIG_PNP_DEBUG_MESSAGES is not set
 CONFIG_BLK_DEV_LOOP=m
-CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
 CONFIG_BLK_DEV_RAM=y
 CONFIG_SGI_XP=m
···
 # CONFIG_HW_RANDOM is not set
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EFI=y
-CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m
 CONFIG_AGP_I460=m

arch/ia64/configs/gensparse_defconfig

···
 CONFIG_SYN_COOKIES=y
 # CONFIG_IPV6 is not set
 CONFIG_BLK_DEV_LOOP=m
-CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
 CONFIG_BLK_DEV_RAM=y
 CONFIG_ATA=y
-CONFIG_BLK_DEV_IDECD=y
 CONFIG_ATA_GENERIC=y
 CONFIG_PATA_CMD64X=y
 CONFIG_ATA_PIIX=y
···
 # CONFIG_HW_RANDOM is not set
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EFI=y
-CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m
 CONFIG_AGP_I460=m

arch/ia64/configs/tiger_defconfig

···
 CONFIG_SYN_COOKIES=y
 # CONFIG_IPV6 is not set
 CONFIG_BLK_DEV_LOOP=m
-CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
 CONFIG_BLK_DEV_RAM=y
 CONFIG_ATA=y
···
 # CONFIG_HW_RANDOM is not set
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EFI=y
-CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m
 CONFIG_AGP_I460=m

arch/ia64/configs/zx1_defconfig

···
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_CHR_DEV_ST=y
-CONFIG_CHR_DEV_OSST=y
 CONFIG_BLK_DEV_SR=y
 CONFIG_CHR_DEV_SG=y
 CONFIG_SCSI_CONSTANTS=y

arch/ia64/include/asm/processor.h

···
 struct mm_struct;
 struct task_struct;
 
-/*
- * Free all resources held by a thread. This is called after the
- * parent of DEAD_TASK has collected the exit status of the task via
- * wait().
- */
-#define release_thread(dead_task)
-
 /* Get wait channel for task P.  */
 extern unsigned long __get_wchan (struct task_struct *p);
 

arch/ia64/kernel/mca.c

···
 	p->parent = p->real_parent = p->group_leader = p;
 	INIT_LIST_HEAD(&p->children);
 	INIT_LIST_HEAD(&p->sibling);
-	strncpy(p->comm, type, sizeof(p->comm)-1);
+	strscpy(p->comm, type, sizeof(p->comm)-1);
 }
 
 /* Caller prevents this from being called after init */

arch/ia64/kernel/setup.c

···
 	ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);
 
 	*cmdline_p = __va(ia64_boot_param->command_line);
-	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
+	strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 
 	efi_init();
 	io_port_init();

arch/ia64/kernel/sys_ia64.c

···
 		force_successful_syscall_return();
 	return addr;
 }
+
+asmlinkage long
+ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *tp)
+{
+	/*
+	 * ia64's clock_gettime() syscall is implemented as a vdso call
+	 * fsys_clock_gettime(). Currently it handles only
+	 * CLOCK_REALTIME and CLOCK_MONOTONIC. Both are based on
+	 * 'ar.itc' counter which gets incremented at a constant
+	 * frequency. It's usually 400MHz, ~2.5x times slower than CPU
+	 * clock frequency. Which is almost a 1ns hrtimer, but not quite.
+	 *
+	 * Let's special-case these timers to report correct precision
+	 * based on ITC frequency and not HZ frequency for supported
+	 * clocks.
+	 */
+	switch (which_clock) {
+	case CLOCK_REALTIME:
+	case CLOCK_MONOTONIC:
+		s64 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
+		struct timespec64 rtn_tp = ns_to_timespec64(tick_ns);
+		return put_timespec64(&rtn_tp, tp);
+	}
+
+	return sys_clock_getres(which_clock, tp);
+}

arch/ia64/kernel/syscalls/syscall.tbl

···
 228	common	timer_delete			sys_timer_delete
 229	common	clock_settime			sys_clock_settime
 230	common	clock_gettime			sys_clock_gettime
-231	common	clock_getres			sys_clock_getres
+231	common	clock_getres			ia64_clock_getres
 232	common	clock_nanosleep			sys_clock_nanosleep
 233	common	fstatfs64			sys_fstatfs64
 234	common	statfs64			sys_statfs64

arch/loongarch/include/asm/processor.h

···
 
 struct task_struct;
 
-/* Free all resources held by a thread. */
-#define release_thread(thread) do { } while (0)
-
 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT, IDLE_POLL};
 
 extern unsigned long		boot_option_idle_override;

arch/m68k/include/asm/processor.h

···
 /* Forward declaration, a strange C thing */
 struct task_struct;
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
 unsigned long __get_wchan(struct task_struct *p);
 void show_registers(struct pt_regs *regs);
 

arch/microblaze/configs/mmu_defconfig

···
 CONFIG_CIFS_STATS2=y
 CONFIG_ENCRYPTED_KEYS=y
 CONFIG_DMA_CMA=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_KGDB=y
 CONFIG_KGDB_TESTS=y
 CONFIG_KGDB_KDB=y

arch/microblaze/include/asm/processor.h

···
 	.pgdir = swapper_pg_dir, \
 }
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
 unsigned long __get_wchan(struct task_struct *p);
 
 /* The size allocated for kernel stacks. This _must_ be a power of two! */

arch/mips/configs/bcm47xx_defconfig

···
 CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
 CONFIG_CRC32_SARWATE=y
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_INFO_REDUCED=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_DEBUG_FS=y

arch/mips/configs/cavium_octeon_defconfig

···
 CONFIG_CRYPTO_SHA256_OCTEON=m
 CONFIG_CRYPTO_SHA512_OCTEON=m
 CONFIG_CRYPTO_DES=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_FS=y
 CONFIG_MAGIC_SYSRQ=y
 # CONFIG_SCHED_DEBUG is not set

arch/mips/configs/ci20_defconfig

···
 CONFIG_DMA_CMA=y
 CONFIG_CMA_SIZE_MBYTES=32
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y

arch/mips/configs/cu1000-neo_defconfig

···
 CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
 CONFIG_CONSOLE_LOGLEVEL_QUIET=15
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y

arch/mips/configs/cu1830-neo_defconfig

···
 CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
 CONFIG_CONSOLE_LOGLEVEL_QUIET=15
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y

arch/mips/configs/generic_defconfig

···
 # CONFIG_XZ_DEC_ARMTHUMB is not set
 # CONFIG_XZ_DEC_SPARC is not set
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_INFO_REDUCED=y
 CONFIG_DEBUG_FS=y
 # CONFIG_SCHED_DEBUG is not set

arch/mips/configs/omega2p_defconfig

···
 CONFIG_CRC16=y
 CONFIG_XZ_DEC=y
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_DEBUG_FS=y
 CONFIG_MAGIC_SYSRQ=y

arch/mips/configs/qi_lb60_defconfig

···
 CONFIG_FONTS=y
 CONFIG_FONT_SUN8x16=y
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_READABLE_ASM=y
 CONFIG_KGDB=y

arch/mips/configs/vocore2_defconfig

···
 CONFIG_CRC16=y
 CONFIG_XZ_DEC=y
 CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_STRIP_ASM_SYMS=y
 CONFIG_DEBUG_FS=y
 CONFIG_MAGIC_SYSRQ=y

arch/mips/include/asm/processor.h

···
 
 struct task_struct;
 
-/* Free all resources held by a thread. */
-#define release_thread(thread) do { } while(0)
-
 /*
  * Do necessary setup to start up a newly executed thread.
  */

arch/nios2/configs/10m50_defconfig

···
 CONFIG_NFS_V3_ACL=y
 CONFIG_ROOT_NFS=y
 CONFIG_SUNRPC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y

arch/nios2/configs/3c120_defconfig

···
 CONFIG_NFS_V3_ACL=y
 CONFIG_ROOT_NFS=y
 CONFIG_SUNRPC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y

arch/nios2/include/asm/processor.h

···
 
 struct task_struct;
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
 extern unsigned long __get_wchan(struct task_struct *p);
 
 #define task_pt_regs(p) \

arch/openrisc/include/asm/processor.h

···
 
 
 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
-void release_thread(struct task_struct *);
 unsigned long __get_wchan(struct task_struct *p);
 
 #define cpu_relax()     barrier()

arch/openrisc/kernel/process.c

···
 	show_registers(regs);
 }
 
-void release_thread(struct task_struct *dead_task)
-{
-}
-
 /*
  * Copy the thread-specific (arch specific) info from the current
  * process to the new one p

arch/parisc/include/asm/processor.h

···
 
 struct mm_struct;
 
-/* Free all resources held by a thread. */
-extern void release_thread(struct task_struct *);
-
 extern unsigned long __get_wchan(struct task_struct *p);
 
 #define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])

arch/parisc/kernel/process.c

···
 	*/
 }
 
-void release_thread(struct task_struct *dead_task)
-{
-}
-
 /*
  * Idle thread support
  *

arch/powerpc/include/asm/processor.h

···
 
 struct task_struct;
 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
-void release_thread(struct task_struct *);
 
 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]

arch/powerpc/kernel/process.c

···
 
 #endif /* CONFIG_PPC64 */
 
-void
-release_thread(struct task_struct *t)
-{
-}
-
 /*
  * this gets called so that we can store coprocessor state into memory and
  * copy the current task into the new thread.

arch/riscv/include/asm/processor.h

···
 extern void start_thread(struct pt_regs *regs,
 			unsigned long pc, unsigned long sp);
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
 extern unsigned long __get_wchan(struct task_struct *p);
 
 

arch/s390/include/asm/processor.h

···
 void show_registers(struct pt_regs *regs);
 void show_cacheinfo(struct seq_file *m);
 
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *tsk) { }
-
 /* Free guarded storage control block */
 void guarded_storage_release(struct task_struct *tsk);
 void gs_load_bc_cb(struct pt_regs *regs);

arch/sh/configs/apsh4a3a_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_DEBUG_PREEMPT is not set
 # CONFIG_DEBUG_BUGVERBOSE is not set
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 # CONFIG_FTRACE is not set
 # CONFIG_CRYPTO_ANSI_CPRNG is not set
 # CONFIG_CRYPTO_HW is not set

arch/sh/configs/apsh4ad0a_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_SHIRQ=y
 CONFIG_DETECT_HUNG_TASK=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_VM=y
 CONFIG_DWARF_UNWINDER=y
 # CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/sh/configs/edosk7760_defconfig

···
 CONFIG_DETECT_HUNG_TASK=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_TIMER_STATS=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_CRYPTO=y
 CONFIG_CRYPTO_MD5=y
 CONFIG_CRYPTO_DES=y

arch/sh/configs/magicpanelr2_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_DEBUG_KOBJECT=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_POINTER=y
 CONFIG_CRC_CCITT=m
 CONFIG_CRC16=m

arch/sh/configs/polaris_defconfig

···
 CONFIG_DEBUG_RT_MUTEXES=y
 CONFIG_DEBUG_LOCK_ALLOC=y
 CONFIG_DEBUG_SPINLOCK_SLEEP=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_SG=y

arch/sh/configs/r7780mp_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DETECT_HUNG_TASK=y
 # CONFIG_DEBUG_PREEMPT is not set
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_CRYPTO_ECB=m
 CONFIG_CRYPTO_PCBC=m
 CONFIG_CRYPTO_HMAC=y

arch/sh/configs/r7785rp_defconfig

···
 # CONFIG_DEBUG_PREEMPT is not set
 CONFIG_DEBUG_LOCK_ALLOC=y
 CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_SH_STANDARD_BIOS=y
 CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_4KSTACKS=y

arch/sh/configs/rsk7203_defconfig

···
 CONFIG_DEBUG_OBJECTS=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_DEBUG_SPINLOCK_SLEEP=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_VM=y
 CONFIG_DEBUG_LIST=y
 CONFIG_DEBUG_SG=y

arch/sh/configs/sdk7780_defconfig

···
 CONFIG_DETECT_HUNG_TASK=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_TIMER_STATS=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_SH_STANDARD_BIOS=y
 CONFIG_CRYPTO_MD5=y
 CONFIG_CRYPTO_DES=y

arch/sh/configs/se7712_defconfig

···
 CONFIG_NFS_FS=y
 CONFIG_ROOT_NFS=y
 CONFIG_DEBUG_KERNEL=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_POINTER=y
 CONFIG_CRYPTO_ECB=m
 CONFIG_CRYPTO_PCBC=m

arch/sh/configs/se7721_defconfig

···
 CONFIG_NLS_CODEPAGE_932=y
 CONFIG_NLS_ISO8859_1=y
 CONFIG_DEBUG_KERNEL=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_POINTER=y
 # CONFIG_CRYPTO_ANSI_CPRNG is not set
 CONFIG_CRC_CCITT=y

arch/sh/configs/sh2007_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_DETECT_SOFTLOCKUP is not set
 # CONFIG_SCHED_DEBUG is not set
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_POINTER=y
 CONFIG_SH_STANDARD_BIOS=y
 CONFIG_CRYPTO_NULL=y

arch/sh/configs/sh7757lcr_defconfig

···
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_SCHED_DEBUG is not set
 # CONFIG_DEBUG_BUGVERBOSE is not set
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 # CONFIG_FTRACE is not set
 # CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/sh/configs/sh7785lcr_32bit_defconfig

···
 CONFIG_DEBUG_SPINLOCK=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_DEBUG_SPINLOCK_SLEEP=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_LATENCYTOP=y
 # CONFIG_FTRACE is not set
 CONFIG_CRYPTO_HMAC=y

arch/sh/configs/urquell_defconfig

···
 CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DETECT_HUNG_TASK=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_POINTER=y
 # CONFIG_FTRACE is not set
 # CONFIG_DUMP_CODE is not set

arch/sh/include/asm/processor_32.h

···
 
 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
 
-/* Free all resources held by a thread. */
-extern void release_thread(struct task_struct *);
-
 /*
  * FPU lazy state save handling.
  */

arch/sh/kernel/process_32.c

···
 #endif
 }
 
-void release_thread(struct task_struct *dead_task)
-{
-	/* do nothing */
-}
-
 asmlinkage void ret_from_fork(void);
 asmlinkage void ret_from_kernel_thread(void);
 

arch/sparc/include/asm/processor_32.h

···
 			     : "memory");
 }
 
-/* Free all resources held by a thread. */
-#define release_thread(tsk)		do { } while(0)
-
 unsigned long __get_wchan(struct task_struct *);
 
 #define task_pt_regs(tsk) ((tsk)->thread.kregs)

arch/sparc/include/asm/processor_64.h

···
 	regs->tstate &= ~TSTATE_PEF;	\
 } while (0)
 
-/* Free all resources held by a thread. */
-#define release_thread(tsk)		do { } while (0)
-
 unsigned long __get_wchan(struct task_struct *task);
 
 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)

arch/um/configs/i386_defconfig

···
 CONFIG_PROC_KCORE=y
 CONFIG_TMPFS=y
 CONFIG_NLS=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_KERNEL=y

arch/um/configs/x86_64_defconfig

···
 CONFIG_PROC_KCORE=y
 CONFIG_TMPFS=y
 CONFIG_NLS=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_FRAME_WARN=1024
 CONFIG_DEBUG_KERNEL=y

arch/um/include/asm/processor-generic.h

···
 	.request		= { 0 } \
 }
 
-static inline void release_thread(struct task_struct *task)
-{
-}
-
 /*
  * User space process size: 3GB (default).
  */

arch/x86/include/asm/processor.h

···
 
 #endif /* CONFIG_PARAVIRT_XXL */
 
-/* Free all resources held by a thread. */
-extern void release_thread(struct task_struct *);
-
 unsigned long __get_wchan(struct task_struct *p);
 
 /*

arch/xtensa/configs/audio_kc705_defconfig

···
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_LOCKUP_DETECTOR=y
 # CONFIG_SCHED_DEBUG is not set

arch/xtensa/configs/cadence_csp_defconfig

···
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_LOCKUP_DETECTOR=y
 # CONFIG_SCHED_DEBUG is not set

arch/xtensa/configs/generic_kc705_defconfig

···
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_LOCKUP_DETECTOR=y
 # CONFIG_SCHED_DEBUG is not set

arch/xtensa/configs/nommu_kc705_defconfig

···
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 # CONFIG_FRAME_POINTER is not set
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_VM=y

arch/xtensa/configs/smp_lx200_defconfig

···
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_VM=y
 CONFIG_LOCKUP_DETECTOR=y

arch/xtensa/configs/virt_defconfig

···
 CONFIG_FONTS=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHEDSTATS=y

arch/xtensa/configs/xip_kc705_defconfig

···
 CONFIG_CRYPTO_ANSI_CPRNG=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
-CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DETECT_HUNG_TASK=y
 # CONFIG_SCHED_DEBUG is not set

arch/xtensa/include/asm/processor.h

···
 struct task_struct;
 struct mm_struct;
 
-/* Free all resources held by a thread. */
-#define release_thread(thread) do { } while(0)
-
 extern unsigned long __get_wchan(struct task_struct *p);
 
 #define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)

fs/aio.c

···
 	local_irq_save(flags);
 	kcpu = this_cpu_ptr(ctx->cpu);
 	if (!kcpu->reqs_available) {
-		int old, avail = atomic_read(&ctx->reqs_available);
+		int avail = atomic_read(&ctx->reqs_available);
 
 		do {
 			if (avail < ctx->req_batch)
 				goto out;
-
-			old = avail;
-			avail = atomic_cmpxchg(&ctx->reqs_available,
-					       avail, avail - ctx->req_batch);
-		} while (avail != old);
+		} while (!atomic_try_cmpxchg(&ctx->reqs_available,
+					     &avail, avail - ctx->req_batch));
 
 		kcpu->reqs_available += ctx->req_batch;
 	}

fs/buffer.c

···
 
 static void discard_buffer(struct buffer_head * bh)
 {
-	unsigned long b_state, b_state_old;
+	unsigned long b_state;
 
 	lock_buffer(bh);
 	clear_buffer_dirty(bh);
 	bh->b_bdev = NULL;
-	b_state = bh->b_state;
-	for (;;) {
-		b_state_old = cmpxchg(&bh->b_state, b_state,
-				      (b_state & ~BUFFER_FLAGS_DISCARD));
-		if (b_state_old == b_state)
-			break;
-		b_state = b_state_old;
-	}
+	b_state = READ_ONCE(bh->b_state);
+	do {
+	} while (!try_cmpxchg(&bh->b_state, &b_state,
+			      b_state & ~BUFFER_FLAGS_DISCARD));
 	unlock_buffer(bh);
 }
 

fs/eventpoll.c

···
 	 * added to the list from another CPU: the winner observes
 	 * new->next == new.
 	 */
-	if (cmpxchg(&new->next, new, head) != new)
+	if (!try_cmpxchg(&new->next, &new, head))
 		return false;
 
 	/*

fs/hfs/bnode.c

···
 	int pagenum;
 	int bytes_read;
 	int bytes_to_read;
-	void *vaddr;
 
 	off += node->page_offset;
 	pagenum = off >> PAGE_SHIFT;
···
 		page = node->page[pagenum];
 		bytes_to_read = min_t(int, len - bytes_read, PAGE_SIZE - off);
 
-		vaddr = kmap_atomic(page);
-		memcpy(buf + bytes_read, vaddr + off, bytes_to_read);
-		kunmap_atomic(vaddr);
+		memcpy_from_page(buf + bytes_read, page, off, bytes_to_read);
 
 		pagenum++;
 		off = 0; /* page offset only applies to the first page */
···
 	off += node->page_offset;
 	page = node->page[0];
 
-	memcpy(kmap(page) + off, buf, len);
-	kunmap(page);
+	memcpy_to_page(page, off, buf, len);
 	set_page_dirty(page);
 }
 
···
 	off += node->page_offset;
 	page = node->page[0];
 
-	memset(kmap(page) + off, 0, len);
-	kunmap(page);
+	memzero_page(page, off, len);
 	set_page_dirty(page);
 }
 
···
 	src_page = src_node->page[0];
 	dst_page = dst_node->page[0];
 
-	memcpy(kmap(dst_page) + dst, kmap(src_page) + src, len);
-	kunmap(src_page);
-	kunmap(dst_page);
+	memcpy_page(dst_page, dst, src_page, src, len);
 	set_page_dirty(dst_page);
 }
 
···
 	src += node->page_offset;
 	dst += node->page_offset;
 	page = node->page[0];
-	ptr = kmap(page);
+	ptr = kmap_local_page(page);
 	memmove(ptr + dst, ptr + src, len);
-	kunmap(page);
+	kunmap_local(ptr);
 	set_page_dirty(page);
 }
 
···
 	if (!test_bit(HFS_BNODE_NEW, &node->flags))
 		return node;
 
-	desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) + node->page_offset);
+	desc = (struct hfs_bnode_desc *)(kmap_local_page(node->page[0]) +
+					 node->page_offset);
 	node->prev = be32_to_cpu(desc->prev);
 	node->next = be32_to_cpu(desc->next);
 	node->num_recs = be16_to_cpu(desc->num_recs);
 	node->type = desc->type;
 	node->height = desc->height;
-	kunmap(node->page[0]);
+	kunmap_local(desc);
 
 	switch (node->type) {
 	case HFS_NODE_HEADER:
···
 	}
 
 	pagep = node->page;
-	memset(kmap(*pagep) + node->page_offset, 0,
-	       min((int)PAGE_SIZE, (int)tree->node_size));
+	memzero_page(*pagep, node->page_offset,
+		     min((int)PAGE_SIZE, (int)tree->node_size));
 	set_page_dirty(*pagep);
-	kunmap(*pagep);
 	for (i = 1; i < tree->pages_per_bnode; i++) {
-		memset(kmap(*++pagep), 0, PAGE_SIZE);
+		memzero_page(*++pagep, 0, PAGE_SIZE);
 		set_page_dirty(*pagep);
-		kunmap(*pagep);
 	}
 	clear_bit(HFS_BNODE_NEW, &node->flags);
 	wake_up(&node->lock_wq);

fs/hfs/btree.c

···
 		goto free_inode;
 
 	/* Load the header */
-	head = (struct hfs_btree_header_rec *)(kmap(page) + sizeof(struct hfs_bnode_desc));
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
+					       sizeof(struct hfs_bnode_desc));
 	tree->root = be32_to_cpu(head->root);
 	tree->leaf_count = be32_to_cpu(head->leaf_count);
 	tree->leaf_head = be32_to_cpu(head->leaf_head);
···
 	tree->node_size_shift = ffs(size) - 1;
 	tree->pages_per_bnode = (tree->node_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
-	kunmap(page);
+	kunmap_local(head);
 	put_page(page);
 	return tree;
 
 fail_page:
+	kunmap_local(head);
 	put_page(page);
 free_inode:
 	tree->inode->i_mapping->a_ops = &hfs_aops;
···
 		return;
 	/* Load the header */
 	page = node->page[0];
-	head = (struct hfs_btree_header_rec *)(kmap(page) + sizeof(struct hfs_bnode_desc));
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
+					       sizeof(struct hfs_bnode_desc));
 
 	head->root = cpu_to_be32(tree->root);
 	head->leaf_count = cpu_to_be32(tree->leaf_count);
···
 	head->attributes = cpu_to_be32(tree->attributes);
 	head->depth = cpu_to_be16(tree->depth);
 
-	kunmap(page);
+	kunmap_local(head);
 	set_page_dirty(page);
 	hfs_bnode_put(node);
 }
···
 
 	off += node->page_offset;
 	pagep = node->page + (off >> PAGE_SHIFT);
-	data = kmap(*pagep);
+	data = kmap_local_page(*pagep);
 	off &= ~PAGE_MASK;
 	idx = 0;
 
···
 						idx += i;
 						data[off] |= m;
 						set_page_dirty(*pagep);
-						kunmap(*pagep);
+						kunmap_local(data);
 						tree->free_nodes--;
 						mark_inode_dirty(tree->inode);
 						hfs_bnode_put(node);
···
 				}
 			}
 			if (++off >= PAGE_SIZE) {
-				kunmap(*pagep);
-				data = kmap(*++pagep);
+				kunmap_local(data);
+				data = kmap_local_page(*++pagep);
 				off = 0;
 			}
 			idx += 8;
 			len--;
 		}
-		kunmap(*pagep);
+		kunmap_local(data);
 		nidx = node->next;
 		if (!nidx) {
 			printk(KERN_DEBUG "create new bmap node...\n");
···
 		off = off16;
 		off += node->page_offset;
 		pagep = node->page + (off >> PAGE_SHIFT);
-		data = kmap(*pagep);
+		data = kmap_local_page(*pagep);
 		off &= ~PAGE_MASK;
 	}
 }
···
 	}
 	off += node->page_offset + nidx / 8;
 	page = node->page[off >> PAGE_SHIFT];
-	data = kmap(page);
+	data = kmap_local_page(page);
 	off &= ~PAGE_MASK;
 	m = 1 << (~nidx & 7);
 	byte = data[off];
 	if (!(byte & m)) {
 		pr_crit("trying to free free bnode %u(%d)\n",
 			node->this, node->type);
-		kunmap(page);
+		kunmap_local(data);
 		hfs_bnode_put(node);
 		return;
 	}
 	data[off] = byte & ~m;
 	set_page_dirty(page);
-	kunmap(page);
+	kunmap_local(data);
 	hfs_bnode_put(node);
 	tree->free_nodes++;
 	mark_inode_dirty(tree->inode);

fs/hfsplus/bitmap.c

···
 		start = size;
 		goto out;
 	}
-	pptr = kmap(page);
+	pptr = kmap_local_page(page);
 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
 	i = offset % 32;
 	offset &= ~(PAGE_CACHE_BITS - 1);
···
 			}
 			curr++;
 		}
-		kunmap(page);
+		kunmap_local(pptr);
 		offset += PAGE_CACHE_BITS;
 		if (offset >= size)
 			break;
···
 			start = size;
 			goto out;
 		}
-		curr = pptr = kmap(page);
+		curr = pptr = kmap_local_page(page);
 		if ((size ^ offset) / PAGE_CACHE_BITS)
 			end = pptr + PAGE_CACHE_BITS / 32;
 		else
···
 			len -= 32;
 		}
 		set_page_dirty(page);
-		kunmap(page);
+		kunmap_local(pptr);
 		offset += PAGE_CACHE_BITS;
 		page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,
 					 NULL);
···
 			start = size;
 			goto out;
 		}
-		pptr = kmap(page);
+		pptr = kmap_local_page(page);
 		curr = pptr;
 		end = pptr + PAGE_CACHE_BITS / 32;
 	}
···
 done:
 	*curr = cpu_to_be32(n);
 	set_page_dirty(page);
-	kunmap(page);
+	kunmap_local(pptr);
 	*max = offset + (curr - pptr) * 32 + i - start;
 	sbi->free_blocks -= *max;
 	hfsplus_mark_mdb_dirty(sb);
···
 	page = read_mapping_page(mapping, pnr, NULL);
 	if (IS_ERR(page))
 		goto kaboom;
-	pptr = kmap(page);
+	pptr = kmap_local_page(page);
 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
 	end = pptr + PAGE_CACHE_BITS / 32;
 	len = count;
···
 		if (!count)
 			break;
 		set_page_dirty(page);
-		kunmap(page);
+		kunmap_local(pptr);
 		page = read_mapping_page(mapping, ++pnr, NULL);
 		if (IS_ERR(page))
 			goto kaboom;
-		pptr = kmap(page);
+		pptr = kmap_local_page(page);
 		curr = pptr;
 		end = pptr + PAGE_CACHE_BITS / 32;
 	}
···
 	}
 out:
 	set_page_dirty(page);
-	kunmap(page);
+	kunmap_local(pptr);
 	sbi->free_blocks += len;
 	hfsplus_mark_mdb_dirty(sb);
 	mutex_unlock(&sbi->alloc_mutex);

fs/hfsplus/bnode.c

···
 	off &= ~PAGE_MASK;
 
 	l = min_t(int, len, PAGE_SIZE - off);
-	memcpy(buf, kmap(*pagep) + off, l);
-	kunmap(*pagep);
+	memcpy_from_page(buf, *pagep, off, l);
 
 	while ((len -= l) != 0) {
 		buf += l;
 		l = min_t(int, len, PAGE_SIZE);
-		memcpy(buf, kmap(*++pagep), l);
-		kunmap(*pagep);
+		memcpy_from_page(buf, *++pagep, 0, l);
 	}
 }
 
···
 	off &= ~PAGE_MASK;
 
 	l = min_t(int, len, PAGE_SIZE - off);
-	memcpy(kmap(*pagep) + off, buf, l);
+	memcpy_to_page(*pagep, off, buf, l);
 	set_page_dirty(*pagep);
-	kunmap(*pagep);
 
 	while ((len -= l) != 0) {
 		buf += l;
 		l = min_t(int, len, PAGE_SIZE);
-		memcpy(kmap(*++pagep), buf, l);
+		memcpy_to_page(*++pagep, 0, buf, l);
 		set_page_dirty(*pagep);
-		kunmap(*pagep);
 	}
 }
 
···
 	off &= ~PAGE_MASK;
 
 	l = min_t(int, len, PAGE_SIZE - off);
-	memset(kmap(*pagep) + off, 0, l);
+	memzero_page(*pagep, off, l);
 	set_page_dirty(*pagep);
-	kunmap(*pagep);
 
 	while ((len -= l) != 0) {
 		l = min_t(int, len, PAGE_SIZE);
-		memset(kmap(*++pagep), 0, l);
+		memzero_page(*++pagep, 0, l);
 		set_page_dirty(*pagep);
-		kunmap(*pagep);
 	}
 }
 
···
 
 	if (src == dst) {
 		l = min_t(int, len, PAGE_SIZE - src);
-		memcpy(kmap(*dst_page) + src, kmap(*src_page) + src, l);
-		kunmap(*src_page);
+		memcpy_page(*dst_page, src, *src_page, src, l);
 		set_page_dirty(*dst_page);
-		kunmap(*dst_page);
 
 		while ((len -= l) != 0) {
 			l = min_t(int, len, PAGE_SIZE);
-			memcpy(kmap(*++dst_page), kmap(*++src_page), l);
-			kunmap(*src_page);
+			memcpy_page(*++dst_page, 0, *++src_page, 0, l);
 			set_page_dirty(*dst_page);
-			kunmap(*dst_page);
 		}
 	} else {
 		void *src_ptr, *dst_ptr;
 
 		do {
-			src_ptr = kmap(*src_page) + src;
-			dst_ptr = kmap(*dst_page) + dst;
+			dst_ptr = kmap_local_page(*dst_page) + dst;
+			src_ptr = kmap_local_page(*src_page) + src;
 			if (PAGE_SIZE - src < PAGE_SIZE - dst) {
 				l = PAGE_SIZE - src;
 				src = 0;
···
 			}
 			l = min(len, l);
 			memcpy(dst_ptr, src_ptr, l);
-			kunmap(*src_page);
+			kunmap_local(src_ptr);
 			set_page_dirty(*dst_page);
-			kunmap(*dst_page);
+			kunmap_local(dst_ptr);
 			if (!dst)
 				dst_page++;
 			else
···
 void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len)
 {
 	struct page **src_page, **dst_page;
+	void *src_ptr, *dst_ptr;
 	int l;
 
 	hfs_dbg(BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len);
···
 
 		if (src == dst) {
 			while (src < len) {
-				memmove(kmap(*dst_page), kmap(*src_page), src);
-				kunmap(*src_page);
+				dst_ptr = kmap_local_page(*dst_page);
+				src_ptr = kmap_local_page(*src_page);
+				memmove(dst_ptr, src_ptr, src);
+				kunmap_local(src_ptr);
 				set_page_dirty(*dst_page);
-				kunmap(*dst_page);
+				kunmap_local(dst_ptr);
 				len -= src;
 				src = PAGE_SIZE;
 				src_page--;
 				dst_page--;
 			}
 			src -= len;
-			memmove(kmap(*dst_page) + src,
-				kmap(*src_page) + src, len);
-			kunmap(*src_page);
+			dst_ptr = kmap_local_page(*dst_page);
+			src_ptr = kmap_local_page(*src_page);
+			memmove(dst_ptr + src, src_ptr + src, len);
+			kunmap_local(src_ptr);
 			set_page_dirty(*dst_page);
-			kunmap(*dst_page);
+			kunmap_local(dst_ptr);
 		} else {
-			void *src_ptr, *dst_ptr;
-
 			do {
-				src_ptr = kmap(*src_page) + src;
-				dst_ptr = kmap(*dst_page) + dst;
+				dst_ptr = kmap_local_page(*dst_page) + dst;
+				src_ptr = kmap_local_page(*src_page) + src;
 				if (src < dst) {
 					l = src;
 					src = PAGE_SIZE;
···
 				}
 				l = min(len, l);
 				memmove(dst_ptr - l, src_ptr - l, l);
-				kunmap(*src_page);
+				kunmap_local(src_ptr);
 				set_page_dirty(*dst_page);
-				kunmap(*dst_page);
+				kunmap_local(dst_ptr);
 				if (dst == PAGE_SIZE)
 					dst_page--;
 				else
···
 
 		if (src == dst) {
 			l = min_t(int, len, PAGE_SIZE - src);
-			memmove(kmap(*dst_page) + src,
-				kmap(*src_page) + src, l);
-			kunmap(*src_page);
+
+			dst_ptr = kmap_local_page(*dst_page) + src;
+			src_ptr = kmap_local_page(*src_page) + src;
+			memmove(dst_ptr, src_ptr, l);
+			kunmap_local(src_ptr);
 			set_page_dirty(*dst_page);
-			kunmap(*dst_page);
+			kunmap_local(dst_ptr);
 
 			while ((len -= l) != 0) {
 				l = min_t(int, len, PAGE_SIZE);
-				memmove(kmap(*++dst_page),
-					kmap(*++src_page), l);
-				kunmap(*src_page);
+				dst_ptr = kmap_local_page(*++dst_page);
+				src_ptr = kmap_local_page(*++src_page);
+				memmove(dst_ptr, src_ptr, l);
+				kunmap_local(src_ptr);
 				set_page_dirty(*dst_page);
-				kunmap(*dst_page);
+				kunmap_local(dst_ptr);
 			}
 		} else {
-			void *src_ptr, *dst_ptr;
-
 			do {
-				src_ptr = kmap(*src_page) + src;
-				dst_ptr = kmap(*dst_page) + dst;
+				dst_ptr = kmap_local_page(*dst_page) + dst;
+				src_ptr = kmap_local_page(*src_page) + src;
 				if (PAGE_SIZE - src <
 						PAGE_SIZE - dst) {
 					l = PAGE_SIZE - src;
···
 				}
 				l = min(len, l);
 				memmove(dst_ptr, src_ptr, l);
-				kunmap(*src_page);
+				kunmap_local(src_ptr);
 				set_page_dirty(*dst_page);
-				kunmap(*dst_page);
+				kunmap_local(dst_ptr);
 				if (!dst)
 					dst_page++;
 				else
···
 	if (!test_bit(HFS_BNODE_NEW, &node->flags))
 		return node;
 
-	desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) +
-			node->page_offset);
+	desc = (struct hfs_bnode_desc *)(kmap_local_page(node->page[0]) +
+							 node->page_offset);
 	node->prev = be32_to_cpu(desc->prev);
 	node->next = be32_to_cpu(desc->next);
 	node->num_recs = be16_to_cpu(desc->num_recs);
 	node->type = desc->type;
 	node->height = desc->height;
-	kunmap(node->page[0]);
+	kunmap_local(desc);
 
 	switch (node->type) {
 	case HFS_NODE_HEADER:
···
 	}
 
 	pagep = node->page;
-	memset(kmap(*pagep) + node->page_offset, 0,
-	       min_t(int, PAGE_SIZE, tree->node_size));
+	memzero_page(*pagep, node->page_offset,
+		     min_t(int, PAGE_SIZE, tree->node_size));
 	set_page_dirty(*pagep);
-	kunmap(*pagep);
 	for (i = 1; i < tree->pages_per_bnode; i++) {
-		memset(kmap(*++pagep), 0, PAGE_SIZE);
+		memzero_page(*++pagep, 0, PAGE_SIZE);
 		set_page_dirty(*pagep);
-		kunmap(*pagep);
 	}
 	clear_bit(HFS_BNODE_NEW, &node->flags);
 	wake_up(&node->lock_wq);

fs/hfsplus/btree.c

···
 		goto free_inode;
 
 	/* Load the header */
-	head = (struct hfs_btree_header_rec *)(kmap(page) +
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
 		sizeof(struct hfs_bnode_desc));
 	tree->root = be32_to_cpu(head->root);
 	tree->leaf_count = be32_to_cpu(head->leaf_count);
···
 		(tree->node_size + PAGE_SIZE - 1) >>
 		PAGE_SHIFT;
 
-	kunmap(page);
+	kunmap_local(head);
 	put_page(page);
 	return tree;
 
  fail_page:
+	kunmap_local(head);
 	put_page(page);
  free_inode:
 	tree->inode->i_mapping->a_ops = &hfsplus_aops;
···
 		return -EIO;
 	/* Load the header */
 	page = node->page[0];
-	head = (struct hfs_btree_header_rec *)(kmap(page) +
+	head = (struct hfs_btree_header_rec *)(kmap_local_page(page) +
 		sizeof(struct hfs_bnode_desc));
 
 	head->root = cpu_to_be32(tree->root);
···
 	head->attributes = cpu_to_be32(tree->attributes);
 	head->depth = cpu_to_be16(tree->depth);
 
-	kunmap(page);
+	kunmap_local(head);
 	set_page_dirty(page);
 	hfs_bnode_put(node);
 	return 0;
···
 
 	off += node->page_offset;
 	pagep = node->page + (off >> PAGE_SHIFT);
-	data = kmap(*pagep);
+	data = kmap_local_page(*pagep);
 	off &= ~PAGE_MASK;
 	idx = 0;
 
···
 						idx += i;
 						data[off] |= m;
 						set_page_dirty(*pagep);
-						kunmap(*pagep);
+						kunmap_local(data);
 						tree->free_nodes--;
 						mark_inode_dirty(tree->inode);
 						hfs_bnode_put(node);
···
 				}
 			}
 			if (++off >= PAGE_SIZE) {
-				kunmap(*pagep);
-				data = kmap(*++pagep);
+				kunmap_local(data);
+				data = kmap_local_page(*++pagep);
 				off = 0;
 			}
 			idx += 8;
 			len--;
 		}
-		kunmap(*pagep);
+		kunmap_local(data);
 		nidx = node->next;
 		if (!nidx) {
 			hfs_dbg(BNODE_MOD, "create new bmap node\n");
···
 		off = off16;
 		off += node->page_offset;
 		pagep = node->page + (off >> PAGE_SHIFT);
-		data = kmap(*pagep);
+		data = kmap_local_page(*pagep);
 		off &= ~PAGE_MASK;
 	}
 }
···
 	}
 	off += node->page_offset + nidx / 8;
 	page = node->page[off >> PAGE_SHIFT];
-	data = kmap(page);
+	data = kmap_local_page(page);
 	off &= ~PAGE_MASK;
 	m = 1 << (~nidx & 7);
 	byte = data[off];
···
 		pr_crit("trying to free free bnode "
 				"%u(%d)\n",
 			node->this, node->type);
-		kunmap(page);
+		kunmap_local(data);
 		hfs_bnode_put(node);
 		return;
 	}
 	data[off] = byte & ~m;
 	set_page_dirty(page);
-	kunmap(page);
+	kunmap_local(data);
 	hfs_bnode_put(node);
 	tree->free_nodes++;
 	mark_inode_dirty(tree->inode);

fs/isofs/compress.c

···
 		for ( i = 0 ; i < pcount ; i++ ) {
 			if (!pages[i])
 				continue;
-			memset(page_address(pages[i]), 0, PAGE_SIZE);
-			flush_dcache_page(pages[i]);
+			memzero_page(pages[i], 0, PAGE_SIZE);
 			SetPageUptodate(pages[i]);
 		}
 		return ((loff_t)pcount) << PAGE_SHIFT;
···
 	       zerr != Z_STREAM_END) {
 		if (!stream.avail_out) {
 			if (pages[curpage]) {
-				stream.next_out = page_address(pages[curpage])
+				stream.next_out = kmap_local_page(pages[curpage])
 						+ poffset;
 				stream.avail_out = PAGE_SIZE - poffset;
 				poffset = 0;
···
 				flush_dcache_page(pages[curpage]);
 				SetPageUptodate(pages[curpage]);
 			}
+			if (stream.next_out != (unsigned char *)zisofs_sink_page) {
+				kunmap_local(stream.next_out);
+				stream.next_out = NULL;
+			}
 			curpage++;
 		}
 		if (!stream.avail_in)
···
 	}
 inflate_out:
 	zlib_inflateEnd(&stream);
+	if (stream.next_out && stream.next_out != (unsigned char *)zisofs_sink_page)
+		kunmap_local(stream.next_out);
 
 z_eio:
 	mutex_unlock(&zisofs_zlib_lock);
···
 	}
 
 	if (poffset && *pages) {
-		memset(page_address(*pages) + poffset, 0,
-		       PAGE_SIZE - poffset);
-		flush_dcache_page(*pages);
+		memzero_page(*pages, poffset, PAGE_SIZE - poffset);
 		SetPageUptodate(*pages);
 	}
 	return 0;
···
 	for (i = 0; i < pcount; i++, index++) {
 		if (i != full_page)
 			pages[i] = grab_cache_page_nowait(mapping, index);
-		if (pages[i]) {
+		if (pages[i])
 			ClearPageError(pages[i]);
-			kmap(pages[i]);
-		}
 	}
 
 	err = zisofs_fill_pages(inode, full_page, pcount, pages);
···
 			flush_dcache_page(pages[i]);
 			if (i == full_page && err)
 				SetPageError(pages[i]);
-			kunmap(pages[i]);
 			unlock_page(pages[i]);
 			if (i != full_page)
 				put_page(pages[i]);

fs/libfs.c

···
 #include <linux/mutex.h>
 #include <linux/namei.h>
 #include <linux/exportfs.h>
+#include <linux/iversion.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h> /* sync_mapping_buffers */
 #include <linux/fs_context.h>
···
 #endif
 }
 EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);
+
+/**
+ * inode_maybe_inc_iversion - increments i_version
+ * @inode: inode with the i_version that should be updated
+ * @force: increment the counter even if it's not necessary?
+ *
+ * Every time the inode is modified, the i_version field must be seen to have
+ * changed by any observer.
+ *
+ * If "force" is set or the QUERIED flag is set, then ensure that we increment
+ * the value, and clear the queried flag.
+ *
+ * In the common case where neither is set, then we can return "false" without
+ * updating i_version.
+ *
+ * If this function returns false, and no other metadata has changed, then we
+ * can avoid logging the metadata.
+ */
+bool inode_maybe_inc_iversion(struct inode *inode, bool force)
+{
+	u64 cur, new;
+
+	/*
+	 * The i_version field is not strictly ordered with any other inode
+	 * information, but the legacy inode_inc_iversion code used a spinlock
+	 * to serialize increments.
+	 *
+	 * Here, we add full memory barriers to ensure that any de-facto
+	 * ordering with other info is preserved.
+	 *
+	 * This barrier pairs with the barrier in inode_query_iversion()
+	 */
+	smp_mb();
+	cur = inode_peek_iversion_raw(inode);
+	do {
+		/* If flag is clear then we needn't do anything */
+		if (!force && !(cur & I_VERSION_QUERIED))
+			return false;
+
+		/* Since lowest bit is flag, add 2 to avoid it */
+		new = (cur & ~I_VERSION_QUERIED) + I_VERSION_INCREMENT;
+	} while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new));
+	return true;
+}
+EXPORT_SYMBOL(inode_maybe_inc_iversion);

fs/nilfs2/btree.c

···
 	maxkey = nilfs_btree_node_get_key(node, nchildren - 1);
 	nextmaxkey = (nchildren > 1) ?
 		nilfs_btree_node_get_key(node, nchildren - 2) : 0;
-	if (bh != NULL)
-		brelse(bh);
+	brelse(bh);
 
 	return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW);
 }
···
 		ptrs[i] = le64_to_cpu(dptrs[i]);
 	}
 
-	if (bh != NULL)
-		brelse(bh);
+	brelse(bh);
 
 	return nitems;
 }

fs/nilfs2/segment.c

···
 		nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
 		nilfs_cpfile_put_checkpoint(
 			nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
-	} else
-		WARN_ON(err == -EINVAL || err == -ENOENT);
-
+	} else if (err == -EINVAL || err == -ENOENT) {
+		nilfs_error(sci->sc_super,
+			    "checkpoint creation failed due to metadata corruption.");
+		err = -EIO;
+	}
 	return err;
 }
 
···
 	err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
 					  &raw_cp, &bh_cp);
 	if (unlikely(err)) {
-		WARN_ON(err == -EINVAL || err == -ENOENT);
+		if (err == -EINVAL || err == -ENOENT) {
+			nilfs_error(sci->sc_super,
+				    "checkpoint finalization failed due to metadata corruption.");
+			err = -EIO;
+		}
 		goto failed_ibh;
 	}
 	raw_cp->cp_snapshot_list.ssl_next = 0;
···
 	struct the_nilfs *nilfs = sb->s_fs_info;
 	struct nilfs_sc_info *sci = nilfs->ns_writer;
 	struct nilfs_transaction_info *ti;
-	int err;
 
 	if (!sci)
 		return -EROFS;
···
 	/* A call inside transactions causes a deadlock. */
 	BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
 
-	err = nilfs_segctor_sync(sci);
-	return err;
+	return nilfs_segctor_sync(sci);
 }
 
 /**

fs/ntfs/attrib.c

···
 	for (;;	a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))) {
 		u8 *mrec_end = (u8 *)ctx->mrec +
 		               le32_to_cpu(ctx->mrec->bytes_allocated);
-		u8 *name_end = (u8 *)a + le16_to_cpu(a->name_offset) +
-			       a->name_length * sizeof(ntfschar);
-		if ((u8*)a < (u8*)ctx->mrec || (u8*)a > mrec_end ||
-		    name_end > mrec_end)
+		u8 *name_end;
+
+		/* check whether ATTR_RECORD wrap */
+		if ((u8 *)a < (u8 *)ctx->mrec)
 			break;
+
+		/* check whether Attribute Record Header is within bounds */
+		if ((u8 *)a > mrec_end ||
+		    (u8 *)a + sizeof(ATTR_RECORD) > mrec_end)
+			break;
+
+		/* check whether ATTR_RECORD's name is within bounds */
+		name_end = (u8 *)a + le16_to_cpu(a->name_offset) +
+			   a->name_length * sizeof(ntfschar);
+		if (name_end > mrec_end)
+			break;
+
 		ctx->attr = a;
 		if (unlikely(le32_to_cpu(a->type) > le32_to_cpu(type) ||
 				a->type == AT_END))
 			return -ENOENT;
 		if (unlikely(!a->length))
 			break;
+
+		/* check whether ATTR_RECORD's length wrap */
+		if ((u8 *)a + le32_to_cpu(a->length) < (u8 *)a)
+			break;
+		/* check whether ATTR_RECORD's length is within bounds */
+		if ((u8 *)a + le32_to_cpu(a->length) > mrec_end)
+			break;
+
 		if (a->type != type)
 			continue;
 		/*

fs/ntfs/inode.c

···
 		goto err_out;
 	}
 
+	/* Sanity check offset to the first attribute */
+	if (le16_to_cpu(m->attrs_offset) >= le32_to_cpu(m->bytes_allocated)) {
+		ntfs_error(sb, "Incorrect mft offset to the first attribute %u in superblock.",
+			       le16_to_cpu(m->attrs_offset));
+		goto err_out;
+	}
+
 	/* Need this to sanity check attribute list references to $MFT. */
 	vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
 

fs/ocfs2/ocfs2_fs.h

···
  * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
  */
 struct ocfs2_slot_map {
-/*00*/	__le16 sm_slots[0];
+/*00*/	DECLARE_FLEX_ARRAY(__le16, sm_slots);
 /*
  * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
  * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
···
  * i_size.
  */
 struct ocfs2_slot_map_extended {
-/*00*/	struct ocfs2_extended_slot se_slots[0];
+/*00*/	DECLARE_FLEX_ARRAY(struct ocfs2_extended_slot, se_slots);
 /*
  * Actual size is i_size of the slot_map system file.  It should
  * match s_max_slots * sizeof(struct ocfs2_extended_slot)
···
 		struct ocfs2_extent_list	i_list;
 		struct ocfs2_truncate_log	i_dealloc;
 		struct ocfs2_inline_data	i_data;
-		__u8               		i_symlink[0];
+		DECLARE_FLEX_ARRAY(__u8,	i_symlink);
 	} id2;
 /* Actual on-disk size is one block */
 };
···
 /*30*/	struct ocfs2_block_check bg_check;	/* Error checking */
 	__le64   bg_reserved2;
 /*40*/	union {
-		__u8    bg_bitmap[0];
+		DECLARE_FLEX_ARRAY(__u8, bg_bitmap);
 		struct {
 			/*
 			 * Block groups may be discontiguous when

fs/ocfs2/refcounttree.c

···
 }
 
 /*
- * Calculate out the start and number of virtual clusters we need to to CoW.
+ * Calculate out the start and number of virtual clusters we need to CoW.
  *
  * cpos is vitual start cluster position we want to do CoW in a
  * file and write_len is the cluster length.

fs/ocfs2/stackglue.c

···
 		goto out;
 	}
 
-	strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1);
+	strscpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1);
 	new_conn->cc_namelen = grouplen;
 	if (cluster_name_len)
-		strlcpy(new_conn->cc_cluster_name, cluster_name,
+		strscpy(new_conn->cc_cluster_name, cluster_name,
 			CLUSTER_NAME_MAX + 1);
 	new_conn->cc_cluster_name_len = cluster_name_len;
 	new_conn->cc_recovery_handler = recovery_handler;

fs/ocfs2/suballoc.h

···
 			 u32 *cluster_start,
 			 u32 *num_clusters);
 /*
- * Use this variant of ocfs2_claim_clusters to specify a maxiumum
+ * Use this variant of ocfs2_claim_clusters to specify a maximum
  * number of clusters smaller than the allocation reserved.
  */
 int __ocfs2_claim_clusters(handle_t *handle,

fs/ocfs2/super.c

···
 		goto out_journal;
 	}
 
-	strlcpy(osb->vol_label, di->id2.i_super.s_label,
+	strscpy(osb->vol_label, di->id2.i_super.s_label,
 		OCFS2_MAX_VOL_LABEL_LEN);
 	osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
 	osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);

fs/proc/Kconfig

···
 
 config PROC_CHILDREN
 	bool "Include /proc/<pid>/task/<tid>/children file"
+	depends on PROC_FS
 	default n
 	help
 	  Provides a fast way to retrieve first level children pids of a task. See

fs/proc/devices.c

···
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/blkdev.h>
+#include "internal.h"
 
 static int devinfo_show(struct seq_file *f, void *v)
 {
···
 
 static int __init proc_devices_init(void)
 {
-	proc_create_seq("devices", 0, NULL, &devinfo_ops);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_seq("devices", 0, NULL, &devinfo_ops);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_devices_init);

fs/proc/internal.h

···
 	return pde->flags & PROC_ENTRY_PERMANENT;
 }
 
+static inline void pde_make_permanent(struct proc_dir_entry *pde)
+{
+	pde->flags |= PROC_ENTRY_PERMANENT;
+}
+
 extern struct kmem_cache *proc_dir_entry_cache;
 void pde_free(struct proc_dir_entry *pde);
 

fs/proc/loadavg.c

···
 #include <linux/seq_file.h>
 #include <linux/seqlock.h>
 #include <linux/time.h>
+#include "internal.h"
 
 static int loadavg_proc_show(struct seq_file *m, void *v)
 {
···
 
 static int __init proc_loadavg_init(void)
 {
-	proc_create_single("loadavg", 0, NULL, loadavg_proc_show);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("loadavg", 0, NULL, loadavg_proc_show);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_loadavg_init);

fs/proc/meminfo.c

···
 
 static int __init proc_meminfo_init(void)
 {
-	proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_meminfo_init);

fs/proc/page.c

···
 }
 
 static const struct proc_ops kpagecount_proc_ops = {
+	.proc_flags	= PROC_ENTRY_PERMANENT,
 	.proc_lseek	= mem_lseek,
 	.proc_read	= kpagecount_read,
 };
···
 }
 
 static const struct proc_ops kpageflags_proc_ops = {
+	.proc_flags	= PROC_ENTRY_PERMANENT,
 	.proc_lseek	= mem_lseek,
 	.proc_read	= kpageflags_read,
 };
···
 }
 
 static const struct proc_ops kpagecgroup_proc_ops = {
+	.proc_flags	= PROC_ENTRY_PERMANENT,
 	.proc_lseek	= mem_lseek,
 	.proc_read	= kpagecgroup_read,
 };

fs/proc/softirqs.c

···
 #include <linux/kernel_stat.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include "internal.h"
 
 /*
  * /proc/softirqs  ... display the number of softirqs
···
 
 static int __init proc_softirqs_init(void)
 {
-	proc_create_single("softirqs", 0, NULL, show_softirqs);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("softirqs", 0, NULL, show_softirqs);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_softirqs_init);

fs/proc/uptime.c

···
 #include <linux/time.h>
 #include <linux/time_namespace.h>
 #include <linux/kernel_stat.h>
+#include "internal.h"
 
 static int uptime_proc_show(struct seq_file *m, void *v)
 {
···
 
 static int __init proc_uptime_init(void)
 {
-	proc_create_single("uptime", 0, NULL, uptime_proc_show);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("uptime", 0, NULL, uptime_proc_show);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_uptime_init);

fs/proc/version.c

···
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/utsname.h>
+#include "internal.h"
 
 static int version_proc_show(struct seq_file *m, void *v)
 {
···
 
 static int __init proc_version_init(void)
 {
-	proc_create_single("version", 0, NULL, version_proc_show);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("version", 0, NULL, version_proc_show);
+	pde_make_permanent(pde);
 	return 0;
 }
 fs_initcall(proc_version_init);

fs/qnx6/inode.c

···
 out1:
 	iput(sbi->inodes);
 out:
-	if (bh1)
-		brelse(bh1);
-	if (bh2)
-		brelse(bh2);
+	brelse(bh1);
+	brelse(bh2);
 outnobh:
 	kfree(qs);
 	s->s_fs_info = NULL;

fs/reiserfs/procfs.c

···
 	char *s;
 
 	/* Some block devices use /'s */
-	strlcpy(b, sb->s_id, BDEVNAME_SIZE);
+	strscpy(b, sb->s_id, BDEVNAME_SIZE);
 	s = strchr(b, '/');
 	if (s)
 		*s = '!';
···
 		char *s;
 
 		/* Some block devices use /'s */
-		strlcpy(b, sb->s_id, BDEVNAME_SIZE);
+		strscpy(b, sb->s_id, BDEVNAME_SIZE);
 		s = strchr(b, '/');
 		if (s)
 			*s = '!';

include/asm-generic/unaligned.h

···
 	__put_unaligned_le24(val, p);
 }
 
-static inline void __put_unaligned_be48(const u64 val, __u8 *p)
+static inline void __put_unaligned_be48(const u64 val, u8 *p)
 {
 	*p++ = val >> 40;
 	*p++ = val >> 32;

include/linux/bitops.h

···
 	const typeof(*(ptr)) mask__ = (mask), bits__ = (bits);	\
 	typeof(*(ptr)) old__, new__;				\
 								\
+	old__ = READ_ONCE(*(ptr));				\
 	do {							\
-		old__ = READ_ONCE(*(ptr));			\
 		new__ = (old__ & ~mask__) | bits__;		\
-	} while (cmpxchg(ptr, old__, new__) != old__);		\
+	} while (!try_cmpxchg(ptr, &old__, new__));		\
 								\
 	old__;							\
 })
···
 	const typeof(*(ptr)) clear__ = (clear), test__ = (test);\
 	typeof(*(ptr)) old__, new__;				\
 								\
+	old__ = READ_ONCE(*(ptr));				\
 	do {							\
-		old__ = READ_ONCE(*(ptr));			\
+		if (old__ & test__)				\
+			break;					\
 		new__ = old__ & ~clear__;			\
-	} while (!(old__ & test__) &&				\
-		 cmpxchg(ptr, old__, new__) != old__);		\
+	} while (!try_cmpxchg(ptr, &old__, new__));		\
 								\
 	!(old__ & test__);					\
 })

include/linux/entry-common.h

···
 /**
  * arch_do_signal_or_restart -  Architecture specific signal delivery function
  * @regs:	Pointer to currents pt_regs
- * @has_signal:	actual signal to handle
  *
  * Invoked from exit_to_user_mode_loop().
  */

include/linux/init.h

···
 
 extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
 
-/* Used for contructor calls. */
+/* Used for constructor calls. */
 typedef void (*ctor_fn_t)(void);
 
 struct file_system_type;

include/linux/ipc_namespace.h

···
 #include <linux/refcount.h>
 #include <linux/rhashtable-types.h>
 #include <linux/sysctl.h>
+#include <linux/percpu_counter.h>
 
 struct user_namespace;
 
···
 	unsigned int	msg_ctlmax;
 	unsigned int	msg_ctlmnb;
 	unsigned int	msg_ctlmni;
-	atomic_t	msg_bytes;
-	atomic_t	msg_hdrs;
+	struct percpu_counter percpu_msg_bytes;
+	struct percpu_counter percpu_msg_hdrs;
 
 	size_t		shm_ctlmax;
 	size_t		shm_ctlall;

include/linux/iversion.h

···
 static inline void
 inode_set_max_iversion_raw(struct inode *inode, u64 val)
 {
-	u64 cur, old;
+	u64 cur = inode_peek_iversion_raw(inode);
 
-	cur = inode_peek_iversion_raw(inode);
-	for (;;) {
+	do {
 		if (cur > val)
 			break;
-		old = atomic64_cmpxchg(&inode->i_version, cur, val);
-		if (likely(old == cur))
-			break;
-		cur = old;
-	}
+	} while (!atomic64_try_cmpxchg(&inode->i_version, &cur, val));
 }
 
 /**
···
 				I_VERSION_QUERIED);
 }
 
-/**
- * inode_maybe_inc_iversion - increments i_version
- * @inode: inode with the i_version that should be updated
- * @force: increment the counter even if it's not necessary?
- *
- * Every time the inode is modified, the i_version field must be seen to have
- * changed by any observer.
- *
- * If "force" is set or the QUERIED flag is set, then ensure that we increment
- * the value, and clear the queried flag.
- *
- * In the common case where neither is set, then we can return "false" without
- * updating i_version.
- *
- * If this function returns false, and no other metadata has changed, then we
- * can avoid logging the metadata.
- */
-static inline bool
-inode_maybe_inc_iversion(struct inode *inode, bool force)
-{
-	u64 cur, old, new;
-
-	/*
-	 * The i_version field is not strictly ordered with any other inode
-	 * information, but the legacy inode_inc_iversion code used a spinlock
-	 * to serialize increments.
-	 *
-	 * Here, we add full memory barriers to ensure that any de-facto
-	 * ordering with other info is preserved.
-	 *
-	 * This barrier pairs with the barrier in inode_query_iversion()
-	 */
-	smp_mb();
-	cur = inode_peek_iversion_raw(inode);
-	for (;;) {
-		/* If flag is clear then we needn't do anything */
-		if (!force && !(cur & I_VERSION_QUERIED))
-			return false;
-
-		/* Since lowest bit is flag, add 2 to avoid it */
-		new = (cur & ~I_VERSION_QUERIED) + I_VERSION_INCREMENT;
-
-		old = atomic64_cmpxchg(&inode->i_version, cur, new);
-		if (likely(old == cur))
-			break;
-		cur = old;
-	}
-	return true;
-}
-
+bool inode_maybe_inc_iversion(struct inode *inode, bool force);
 
 /**
  * inode_inc_iversion - forcibly increment i_version
···
 static inline u64
 inode_query_iversion(struct inode *inode)
 {
-	u64 cur, old, new;
+	u64 cur, new;
 
 	cur = inode_peek_iversion_raw(inode);
-	for (;;) {
+	do {
 		/* If flag is already set, then no need to swap */
 		if (cur & I_VERSION_QUERIED) {
 			/*
···
 		}
 
 		new = cur | I_VERSION_QUERIED;
-		old = atomic64_cmpxchg(&inode->i_version, cur, new);
-		if (likely(old == cur))
-			break;
-		cur = old;
-	}
+	} while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new));
 	return cur >> I_VERSION_QUERIED_SHIFT;
 }
 

include/linux/kexec.h

···
 extern bool kexec_in_progress;
 
 int crash_shrink_memory(unsigned long new_size);
-size_t crash_get_memory_size(void);
+ssize_t crash_get_memory_size(void);
 
 #ifndef arch_kexec_protect_crashkres
 /*

include/linux/percpu_counter.h

···
 #include <linux/types.h>
 #include <linux/gfp.h>
 
+/* percpu_counter batch for local add or sub */
+#define PERCPU_COUNTER_LOCAL_BATCH	INT_MAX
+
 #ifdef CONFIG_SMP
 
 struct percpu_counter {
···
 static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
 {
 	percpu_counter_add_batch(fbc, amount, percpu_counter_batch);
+}
+
+/*
+ * With percpu_counter_add_local() and percpu_counter_sub_local(), counts
+ * are accumulated in local per cpu counter and not in fbc->count until
+ * local count overflows PERCPU_COUNTER_LOCAL_BATCH. This makes counter
+ * write efficient.
+ * But percpu_counter_sum(), instead of percpu_counter_read(), needs to be
+ * used to add up the counts from each CPU to account for all the local
+ * counts. So percpu_counter_add_local() and percpu_counter_sub_local()
+ * should be used when a counter is updated frequently and read rarely.
+ */
+static inline void
+percpu_counter_add_local(struct percpu_counter *fbc, s64 amount)
+{
+	percpu_counter_add_batch(fbc, amount, PERCPU_COUNTER_LOCAL_BATCH);
 }
 
 static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
···
 	preempt_enable();
 }
 
+/* non-SMP percpu_counter_add_local is the same with percpu_counter_add */
+static inline void
+percpu_counter_add_local(struct percpu_counter *fbc, s64 amount)
+{
+	percpu_counter_add(fbc, amount);
+}
+
 static inline void
 percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount, s32 batch)
 {
···
 static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
 {
 	percpu_counter_add(fbc, -amount);
+}
+
+static inline void
+percpu_counter_sub_local(struct percpu_counter *fbc, s64 amount)
+{
+	percpu_counter_add_local(fbc, -amount);
 }
 
 #endif /* _LINUX_PERCPU_COUNTER_H */

include/linux/sched/task.h

···
 
 void put_task_struct_rcu_user(struct task_struct *task);
 
+/* Free all architecture-specific resources held by a thread. */
+void release_thread(struct task_struct *dead_task);
+
 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
 extern int arch_task_struct_size __read_mostly;
 #else

init/Kconfig

···
 
 config CHECKPOINT_RESTORE
 	bool "Checkpoint/restore support"
+	depends on PROC_FS
 	select PROC_CHILDREN
 	select KCMP
 	default n

init/do_mounts.c

···
 
 static int __init root_dev_setup(char *line)
 {
-	strlcpy(saved_root_name, line, sizeof(saved_root_name));
+	strscpy(saved_root_name, line, sizeof(saved_root_name));
 	return 1;
 }
 
···
 	int count = 1;
 	char *p = page;
 
-	strlcpy(p, root_fs_names, size);
+	strscpy(p, root_fs_names, size);
 	while (*p++) {
 		if (p[-1] == ',') {
 			p[-1] = '\0';

init/initramfs.c

···
 	return origLen;
 }
 
-static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
+static unsigned long my_inptr __initdata; /* index of next byte to be processed in inbuf */
 
 #include <linux/decompress/generic.h>
 

init/main.c

···
 	if (!data)
 		data = xbc_get_embedded_bootconfig(&size);
 
-	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 	err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
 			 bootconfig_params);
 
···
 		return;
 
 	/* All fall through to do_early_param. */
-	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 	parse_early_options(tmp_cmdline);
 	done = 1;
 }
···
 static __init_or_module void
 trace_initcall_start_cb(void *data, initcall_t fn)
 {
-	ktime_t *calltime = (ktime_t *)data;
+	ktime_t *calltime = data;
 
 	printk(KERN_DEBUG "calling  %pS @ %i\n", fn, task_pid_nr(current));
 	*calltime = ktime_get();
···
 static __init_or_module void
 trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
 {
-	ktime_t rettime, *calltime = (ktime_t *)data;
+	ktime_t rettime, *calltime = data;
 
 	rettime = ktime_get();
 	printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",

ipc/mqueue.c

···
 
 out_unlock:
 	inode_unlock(d_inode(mnt->mnt_root));
-	if (inode)
-		iput(inode);
+	iput(inode);
 	mnt_drop_write(mnt);
 out_name:
 	putname(name);

ipc/msg.c

···
 #include <linux/nsproxy.h>
 #include <linux/ipc_namespace.h>
 #include <linux/rhashtable.h>
+#include <linux/percpu_counter.h>
 
 #include <asm/current.h>
 #include <linux/uaccess.h>
···
 	rcu_read_unlock();
 
 	list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
-		atomic_dec(&ns->msg_hdrs);
+		percpu_counter_sub_local(&ns->percpu_msg_hdrs, 1);
 		free_msg(msg);
 	}
-	atomic_sub(msq->q_cbytes, &ns->msg_bytes);
+	percpu_counter_sub_local(&ns->percpu_msg_bytes, msq->q_cbytes);
 	ipc_update_pid(&msq->q_lspid, NULL);
 	ipc_update_pid(&msq->q_lrpid, NULL);
 	ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
···
 	msginfo->msgssz = MSGSSZ;
 	msginfo->msgseg = MSGSEG;
 	down_read(&msg_ids(ns).rwsem);
-	if (cmd == MSG_INFO) {
+	if (cmd == MSG_INFO)
 		msginfo->msgpool = msg_ids(ns).in_use;
-		msginfo->msgmap = atomic_read(&ns->msg_hdrs);
-		msginfo->msgtql = atomic_read(&ns->msg_bytes);
+	max_idx = ipc_get_maxidx(&msg_ids(ns));
+	up_read(&msg_ids(ns).rwsem);
+	if (cmd == MSG_INFO) {
+		msginfo->msgmap = min_t(int,
+				     percpu_counter_sum(&ns->percpu_msg_hdrs),
+				     INT_MAX);
+		msginfo->msgtql = min_t(int,
+		                     percpu_counter_sum(&ns->percpu_msg_bytes),
+				     INT_MAX);
 	} else {
 		msginfo->msgmap = MSGMAP;
 		msginfo->msgpool = MSGPOOL;
 		msginfo->msgtql = MSGTQL;
 	}
-	max_idx = ipc_get_maxidx(&msg_ids(ns));
-	up_read(&msg_ids(ns).rwsem);
 	return (max_idx < 0) ? 0 : max_idx;
 }
 
···
 		list_add_tail(&msg->m_list, &msq->q_messages);
 		msq->q_cbytes += msgsz;
 		msq->q_qnum++;
-		atomic_add(msgsz, &ns->msg_bytes);
-		atomic_inc(&ns->msg_hdrs);
+		percpu_counter_add_local(&ns->percpu_msg_bytes, msgsz);
+		percpu_counter_add_local(&ns->percpu_msg_hdrs, 1);
 	}
 
 	err = 0;
···
 			msq->q_rtime = ktime_get_real_seconds();
 			ipc_update_pid(&msq->q_lrpid, task_tgid(current));
 			msq->q_cbytes -= msg->m_ts;
-			atomic_sub(msg->m_ts, &ns->msg_bytes);
-			atomic_dec(&ns->msg_hdrs);
+			percpu_counter_sub_local(&ns->percpu_msg_bytes, msg->m_ts);
+			percpu_counter_sub_local(&ns->percpu_msg_hdrs, 1);
 			ss_wakeup(msq, &wake_q, false);
 
 			goto out_unlock0;
···
 }
 #endif
 
-void msg_init_ns(struct ipc_namespace *ns)
+int msg_init_ns(struct ipc_namespace *ns)
 {
+	int ret;
+
 	ns->msg_ctlmax = MSGMAX;
 	ns->msg_ctlmnb = MSGMNB;
 	ns->msg_ctlmni = MSGMNI;
 
-	atomic_set(&ns->msg_bytes, 0);
-	atomic_set(&ns->msg_hdrs, 0);
+	ret = percpu_counter_init(&ns->percpu_msg_bytes, 0, GFP_KERNEL);
+	if (ret)
+		goto fail_msg_bytes;
+	ret = percpu_counter_init(&ns->percpu_msg_hdrs, 0, GFP_KERNEL);
+	if (ret)
+		goto fail_msg_hdrs;
 	ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
+	return 0;
+
+fail_msg_hdrs:
+	percpu_counter_destroy(&ns->percpu_msg_bytes);
+fail_msg_bytes:
+	return ret;
 }
 
 #ifdef CONFIG_IPC_NS
 void msg_exit_ns(struct ipc_namespace *ns)
 {
+	percpu_counter_destroy(&ns->percpu_msg_bytes);
+	percpu_counter_destroy(&ns->percpu_msg_hdrs);
 	free_ipcs(ns, &msg_ids(ns), freeque);
 	idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
 	rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht);

ipc/namespace.c

···
 	if (!setup_ipc_sysctls(ns))
 		goto fail_mq;
 
+	err = msg_init_ns(ns);
+	if (err)
+		goto fail_put;
+
 	sem_init_ns(ns);
-	msg_init_ns(ns);
 	shm_init_ns(ns);
 
 	return ns;

ipc/util.c

···
 	return iter->pid_ns;
 }
 
-/*
- * This routine locks the ipc structure found at least at position pos.
+/**
+ * sysvipc_find_ipc - Find and lock the ipc structure based on seq pos
+ * @ids: ipc identifier set
+ * @pos: expected position
+ *
+ * The function finds an ipc structure, based on the sequence file
+ * position @pos. If there is no ipc structure at position @pos, then
+ * the successor is selected.
+ * If a structure is found, then it is locked (both rcu_read_lock() and
+ * ipc_lock_object()) and  @pos is set to the position needed to locate
+ * the found ipc structure.
+ * If nothing is found (i.e. EOF), @pos is not modified.
+ *
+ * The function returns the found ipc structure, or NULL at EOF.
  */
-static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos,
-					      loff_t *new_pos)
+static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t *pos)
 {
-	struct kern_ipc_perm *ipc = NULL;
-	int max_idx = ipc_get_maxidx(ids);
+	int tmpidx;
+	struct kern_ipc_perm *ipc;
 
-	if (max_idx == -1 || pos > max_idx)
-		goto out;
+	/* convert from position to idr index -> "-1" */
+	tmpidx = *pos - 1;
 
-	for (; pos <= max_idx; pos++) {
-		ipc = idr_find(&ids->ipcs_idr, pos);
-		if (ipc != NULL) {
-			rcu_read_lock();
-			ipc_lock_object(ipc);
-			break;
-		}
+	ipc = idr_get_next(&ids->ipcs_idr, &tmpidx);
+	if (ipc != NULL) {
+		rcu_read_lock();
+		ipc_lock_object(ipc);
+
+		/* convert from idr index to position  -> "+1" */
+		*pos = tmpidx + 1;
 	}
-out:
-	*new_pos = pos + 1;
 	return ipc;
 }
 
···
 	if (ipc && ipc != SEQ_START_TOKEN)
 		ipc_unlock(ipc);
 
-	return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos);
+	/* Next -> search for *pos+1 */
+	(*pos)++;
+	return sysvipc_find_ipc(&iter->ns->ids[iface->ids], pos);
 }
 
 /*
- * File positions: pos 0 -> header, pos n -> ipc id = n - 1.
+ * File positions: pos 0 -> header, pos n -> ipc idx = n - 1.
  * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START.
  */
 static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
···
 	if (*pos == 0)
 		return SEQ_START_TOKEN;
 
-	/* Find the (pos-1)th ipc */
-	return sysvipc_find_ipc(ids, *pos - 1, pos);
+	/* Otherwise return the correct ipc structure */
+	return sysvipc_find_ipc(ids, pos);
 }
 
 static void sysvipc_proc_stop(struct seq_file *s, void *it)

ipc/util.h

···
 
 #ifdef CONFIG_SYSVIPC
 void sem_init_ns(struct ipc_namespace *ns);
-void msg_init_ns(struct ipc_namespace *ns);
+int msg_init_ns(struct ipc_namespace *ns);
 void shm_init_ns(struct ipc_namespace *ns);
 
 void sem_exit_ns(struct ipc_namespace *ns);
···
 void shm_exit_ns(struct ipc_namespace *ns);
 #else
 static inline void sem_init_ns(struct ipc_namespace *ns) { }
-static inline void msg_init_ns(struct ipc_namespace *ns) { }
+static inline int msg_init_ns(struct ipc_namespace *ns) { return 0; }
 static inline void shm_init_ns(struct ipc_namespace *ns) { }
 
 static inline void sem_exit_ns(struct ipc_namespace *ns) { }

kernel/exit.c

···
 		call_rcu(&task->rcu, delayed_put_task_struct);
 }
 
+void __weak release_thread(struct task_struct *dead_task)
+{
+}
+
 void release_task(struct task_struct *p)
 {
 	struct task_struct *leader;

kernel/fail_function.c

···
 	/* cut off if it is too long */
 	if (count > KSYM_NAME_LEN)
 		count = KSYM_NAME_LEN;
-	buf = kmalloc(count + 1, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
 
-	if (copy_from_user(buf, buffer, count)) {
-		ret = -EFAULT;
-		goto out_free;
-	}
-	buf[count] = '\0';
+	buf = memdup_user_nul(buffer, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
 	sym = strstrip(buf);
 
 	mutex_lock(&fei_lock);
···
 	}
 
 	ret = register_kprobe(&attr->kp);
-	if (!ret)
-		fei_debugfs_add_attr(attr);
-	if (ret < 0)
-		fei_attr_remove(attr);
-	else {
-		list_add_tail(&attr->list, &fei_attr_list);
-		ret = count;
+	if (ret) {
+		fei_attr_free(attr);
+		goto out;
 	}
+	fei_debugfs_add_attr(attr);
+	list_add_tail(&attr->list, &fei_attr_list);
+	ret = count;
 out:
 	mutex_unlock(&fei_lock);
-out_free:
 	kfree(buf);
 	return ret;
 }

kernel/fork.c

···
 #include <linux/scs.h>
 #include <linux/io_uring.h>
 #include <linux/bpf.h>
-#include <linux/sched/mm.h>
 
 #include <asm/pgalloc.h>
 #include <linux/uaccess.h>

kernel/kexec.c

···
 
 	/*
 	 * Because we write directly to the reserved memory region when loading
-	 * crash kernels we need a mutex here to prevent multiple crash kernels
-	 * from attempting to load simultaneously, and to prevent a crash kernel
-	 * from loading over the top of a in use crash kernel.
-	 *
-	 * KISS: always take the mutex.
+	 * crash kernels we need a serialization here to prevent multiple crash
+	 * kernels from attempting to load simultaneously.
 	 */
-	if (!mutex_trylock(&kexec_mutex))
+	if (!kexec_trylock())
 		return -EBUSY;
 
 	if (flags & KEXEC_ON_CRASH) {
···
 
 	kimage_free(image);
 out_unlock:
-	mutex_unlock(&kexec_mutex);
+	kexec_unlock();
 	return ret;
 }
 

kernel/kexec_core.c

···
 #include <crypto/hash.h>
 #include "kexec_internal.h"
 
-DEFINE_MUTEX(kexec_mutex);
+atomic_t __kexec_lock = ATOMIC_INIT(0);
 
 /* Per cpu memory for storing cpu states in case of system crash. */
 note_buf_t __percpu *crash_notes;
···
 		if (result < 0)
 			goto out;
 
-		ptr = kmap(page);
+		ptr = kmap_local_page(page);
 		/* Start with a clear page */
 		clear_page(ptr);
 		ptr += maddr & ~PAGE_MASK;
···
 			memcpy(ptr, kbuf, uchunk);
 		else
 			result = copy_from_user(ptr, buf, uchunk);
-		kunmap(page);
+		kunmap_local(ptr);
 		if (result) {
 			result = -EFAULT;
 			goto out;
···
 			goto out;
 		}
 		arch_kexec_post_alloc_pages(page_address(page), 1, 0);
-		ptr = kmap(page);
+		ptr = kmap_local_page(page);
 		ptr += maddr & ~PAGE_MASK;
 		mchunk = min_t(size_t, mbytes,
 				PAGE_SIZE - (maddr & ~PAGE_MASK));
···
 		else
 			result = copy_from_user(ptr, buf, uchunk);
 		kexec_flush_icache_page(page);
-		kunmap(page);
+		kunmap_local(ptr);
 		arch_kexec_pre_free_pages(page_address(page), 1);
 		if (result) {
 			result = -EFAULT;
···
  */
 void __noclone __crash_kexec(struct pt_regs *regs)
 {
-	/* Take the kexec_mutex here to prevent sys_kexec_load
+	/* Take the kexec_lock here to prevent sys_kexec_load
 	 * running on one cpu from replacing the crash kernel
 	 * we are using after a panic on a different cpu.
 	 *
···
 	 * of memory the xchg(&kexec_crash_image) would be
 	 * sufficient.  But since I reuse the memory...
 	 */
-	if (mutex_trylock(&kexec_mutex)) {
+	if (kexec_trylock()) {
 		if (kexec_crash_image) {
 			struct pt_regs fixed_regs;
 
···
 			machine_crash_shutdown(&fixed_regs);
 			machine_kexec(kexec_crash_image);
 		}
-		mutex_unlock(&kexec_mutex);
+		kexec_unlock();
 	}
 }
 STACK_FRAME_NON_STANDARD(__crash_kexec);
···
 	}
 }
 
-size_t crash_get_memory_size(void)
+ssize_t crash_get_memory_size(void)
 {
-	size_t size = 0;
+	ssize_t size = 0;
 
-	mutex_lock(&kexec_mutex);
+	if (!kexec_trylock())
+		return -EBUSY;
+
 	if (crashk_res.end != crashk_res.start)
 		size = resource_size(&crashk_res);
-	mutex_unlock(&kexec_mutex);
+
+	kexec_unlock();
 	return size;
 }
 
···
 	unsigned long old_size;
 	struct resource *ram_res;
 
-	mutex_lock(&kexec_mutex);
+	if (!kexec_trylock())
+		return -EBUSY;
 
 	if (kexec_crash_image) {
 		ret = -ENOENT;
···
 	insert_resource(&iomem_resource, ram_res);
 
 unlock:
-	mutex_unlock(&kexec_mutex);
+	kexec_unlock();
 	return ret;
 }
 
···
 {
 	int error = 0;
 
-	if (!mutex_trylock(&kexec_mutex))
+	if (!kexec_trylock())
 		return -EBUSY;
 	if (!kexec_image) {
 		error = -EINVAL;
···
 #endif
 
  Unlock:
-	mutex_unlock(&kexec_mutex);
+	kexec_unlock();
 	return error;
 }

kernel/kexec_file.c

···
 
 	image = NULL;
 
-	if (!mutex_trylock(&kexec_mutex))
+	if (!kexec_trylock())
 		return -EBUSY;
 
 	dest_image = &kexec_image;
···
 	if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
 		arch_kexec_protect_crashkres();
 
-	mutex_unlock(&kexec_mutex);
+	kexec_unlock();
 	kimage_free(image);
 	return ret;
 }

kernel/kexec_internal.h

···
 int kimage_is_destination_range(struct kimage *image,
 				unsigned long start, unsigned long end);
 
-extern struct mutex kexec_mutex;
+/*
+ * Whatever is used to serialize accesses to the kexec_crash_image needs to be
+ * NMI safe, as __crash_kexec() can happen during nmi_panic(), so here we use a
+ * "simple" atomic variable that is acquired with a cmpxchg().
+ */
+extern atomic_t __kexec_lock;
+static inline bool kexec_trylock(void)
+{
+	return atomic_cmpxchg_acquire(&__kexec_lock, 0, 1) == 0;
+}
+static inline void kexec_unlock(void)
+{
+	atomic_set_release(&__kexec_lock, 0);
+}
 
 #ifdef CONFIG_KEXEC_FILE
 #include <linux/purgatory.h>

kernel/ksysfs.c

···
 static ssize_t kexec_crash_size_show(struct kobject *kobj,
 				       struct kobj_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%zu\n", crash_get_memory_size());
+	ssize_t size = crash_get_memory_size();
+
+	if (size < 0)
+		return size;
+
+	return sprintf(buf, "%zd\n", size);
 }
 static ssize_t kexec_crash_size_store(struct kobject *kobj,
 				   struct kobj_attribute *attr,

kernel/latencytop.c

···
 account_global_scheduler_latency(struct task_struct *tsk,
 				 struct latency_record *lat)
 {
-	int firstnonnull = MAXLR + 1;
+	int firstnonnull = MAXLR;
 	int i;
 
 	/* skip kernel threads for now */
···
 	}
 
 	i = firstnonnull;
-	if (i >= MAXLR - 1)
+	if (i >= MAXLR)
 		return;
 
 	/* Allocted a new one: */

kernel/profile.c

···
 	static const char schedstr[] = "schedule";
 	static const char sleepstr[] = "sleep";
 	static const char kvmstr[] = "kvm";
+	const char *select = NULL;
 	int par;
 
 	if (!strncmp(str, sleepstr, strlen(sleepstr))) {
 #ifdef CONFIG_SCHEDSTATS
 		force_schedstat_enabled();
 		prof_on = SLEEP_PROFILING;
-		if (str[strlen(sleepstr)] == ',')
-			str += strlen(sleepstr) + 1;
-		if (get_option(&str, &par))
-			prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
-		pr_info("kernel sleep profiling enabled (shift: %u)\n",
-			prof_shift);
+		select = sleepstr;
 #else
 		pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
 #endif /* CONFIG_SCHEDSTATS */
 	} else if (!strncmp(str, schedstr, strlen(schedstr))) {
 		prof_on = SCHED_PROFILING;
-		if (str[strlen(schedstr)] == ',')
-			str += strlen(schedstr) + 1;
-		if (get_option(&str, &par))
-			prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
-		pr_info("kernel schedule profiling enabled (shift: %u)\n",
-			prof_shift);
+		select = schedstr;
 	} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
 		prof_on = KVM_PROFILING;
-		if (str[strlen(kvmstr)] == ',')
-			str += strlen(kvmstr) + 1;
-		if (get_option(&str, &par))
-			prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
-		pr_info("kernel KVM profiling enabled (shift: %u)\n",
-			prof_shift);
+		select = kvmstr;
 	} else if (get_option(&str, &par)) {
 		prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
 		prof_on = CPU_PROFILING;
 		pr_info("kernel profiling enabled (shift: %u)\n",
 			prof_shift);
 	}
+
+	if (select) {
+		if (str[strlen(select)] == ',')
+			str += strlen(select) + 1;
+		if (get_option(&str, &par))
+			prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+		pr_info("kernel %s profiling enabled (shift: %u)\n",
+			select, prof_shift);
+	}
+
 	return 1;
 }
 __setup("profile=", profile_setup);

kernel/relay.c

···
  */
 static struct page **relay_alloc_page_array(unsigned int n_pages)
 {
-	const size_t pa_size = n_pages * sizeof(struct page *);
-	if (pa_size > PAGE_SIZE)
-		return vzalloc(pa_size);
-	return kzalloc(pa_size, GFP_KERNEL);
+	return kvcalloc(n_pages, sizeof(struct page *), GFP_KERNEL);
 }
 
 /*

kernel/smpboot.c

···
 
 	/* The outgoing CPU will normally get done quite quickly. */
 	if (atomic_read(&per_cpu(cpu_hotplug_state, cpu)) == CPU_DEAD)
-		goto update_state;
+		goto update_state_early;
 	udelay(5);
 
 	/* But if the outgoing CPU dawdles, wait increasingly long times. */
···
 			break;
 		sleep_jf = DIV_ROUND_UP(sleep_jf * 11, 10);
 	}
-update_state:
+update_state_early:
 	oldstate = atomic_read(&per_cpu(cpu_hotplug_state, cpu));
+update_state:
 	if (oldstate == CPU_DEAD) {
 		/* Outgoing CPU died normally, update state. */
 		smp_mb(); /* atomic_read() before update. */
 		atomic_set(&per_cpu(cpu_hotplug_state, cpu), CPU_POST_DEAD);
 	} else {
 		/* Outgoing CPU still hasn't died, set state accordingly. */
-		if (atomic_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
-				   oldstate, CPU_BROKEN) != oldstate)
+		if (!atomic_try_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
+					&oldstate, CPU_BROKEN))
 			goto update_state;
 		ret = false;
 	}
···
 	int newstate;
 	int cpu = smp_processor_id();
 
+	oldstate = atomic_read(&per_cpu(cpu_hotplug_state, cpu));
 	do {
-		oldstate = atomic_read(&per_cpu(cpu_hotplug_state, cpu));
 		if (oldstate != CPU_BROKEN)
 			newstate = CPU_DEAD;
 		else
 			newstate = CPU_DEAD_FROZEN;
-	} while (atomic_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
-				oldstate, newstate) != oldstate);
+	} while (!atomic_try_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
+				     &oldstate, newstate));
 	return newstate == CPU_DEAD;
 }
 

kernel/task_work.c

···
 	/* record the work call stack in order to print it in KASAN reports */
 	kasan_record_aux_stack(work);
 
+	head = READ_ONCE(task->task_works);
 	do {
-		head = READ_ONCE(task->task_works);
 		if (unlikely(head == &work_exited))
 			return -ESRCH;
 		work->next = head;
-	} while (cmpxchg(&task->task_works, head, work) != head);
+	} while (!try_cmpxchg(&task->task_works, &head, work));
 
 	switch (notify) {
 	case TWA_NONE:
···
 	 * we raced with task_work_run(), *pprev == NULL/exited.
 	 */
 	raw_spin_lock_irqsave(&task->pi_lock, flags);
-	while ((work = READ_ONCE(*pprev))) {
-		if (!match(work, data))
+	work = READ_ONCE(*pprev);
+	while (work) {
+		if (!match(work, data)) {
 			pprev = &work->next;
-		else if (cmpxchg(pprev, work, work->next) == work)
+			work = READ_ONCE(*pprev);
+		} else if (try_cmpxchg(pprev, &work, work->next))
 			break;
 	}
 	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
···
 		 * work->func() can do task_work_add(), do not set
 		 * work_exited unless the list is empty.
 		 */
+		work = READ_ONCE(task->task_works);
 		do {
 			head = NULL;
-			work = READ_ONCE(task->task_works);
 			if (!work) {
 				if (task->flags & PF_EXITING)
 					head = &work_exited;
 				else
 					break;
 			}
-		} while (cmpxchg(&task->task_works, work, head) != work);
+		} while (!try_cmpxchg(&task->task_works, &work, head));
 
 		if (!work)
 			break;

kernel/utsname_sysctl.c

···
 
 static struct ctl_table uts_kern_table[] = {
 	{
+		.procname	= "arch",
+		.data		= init_uts_ns.name.machine,
+		.maxlen		= sizeof(init_uts_ns.name.machine),
+		.mode		= 0444,
+		.proc_handler	= proc_do_uts_string,
+	},
+	{
 		.procname	= "ostype",
 		.data		= init_uts_ns.name.sysname,
 		.maxlen		= sizeof(init_uts_ns.name.sysname),

lib/cmdline.c

···
 				args[i-1] = '\0';
 		}
 	}
-	if (quoted && args[i-1] == '"')
+	if (quoted && i > 0 && args[i-1] == '"')
 		args[i-1] = '\0';
 
 	if (args[i]) {

lib/earlycpio.c

···
 				"File %s exceeding MAX_CPIO_FILE_NAME [%d]\n",
 				p, MAX_CPIO_FILE_NAME);
 			}
-			strlcpy(cd.name, p + mypathsize, MAX_CPIO_FILE_NAME);
+			strscpy(cd.name, p + mypathsize, MAX_CPIO_FILE_NAME);
 
 			cd.data = (void *)dptr;
 			cd.size = ch[C_FILESIZE];

lib/llist.c

···
 
 	do {
 		new_last->next = first = READ_ONCE(head->first);
-	} while (cmpxchg(&head->first, first, new_first) != first);
+	} while (!try_cmpxchg(&head->first, &first, new_first));
 
 	return !first;
 }
···
  */
 struct llist_node *llist_del_first(struct llist_head *head)
 {
-	struct llist_node *entry, *old_entry, *next;
+	struct llist_node *entry, *next;
 
 	entry = smp_load_acquire(&head->first);
-	for (;;) {
+	do {
 		if (entry == NULL)
 			return NULL;
-		old_entry = entry;
 		next = READ_ONCE(entry->next);
-		entry = cmpxchg(&head->first, old_entry, next);
-		if (entry == old_entry)
-			break;
-	}
+	} while (!try_cmpxchg(&head->first, &entry, next));
 
 	return entry;
 }

scripts/checkpatch.pl

···
 	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 	atomic_t
 )};
+our $typeStdioTypedefs = qr{(?x:
+	FILE
+)};
 our $typeTypedefs = qr{(?x:
 	$typeC99Typedefs\b|
 	$typeOtherOSTypedefs\b|
-	$typeKernelTypedefs\b
+	$typeKernelTypedefs\b|
+	$typeStdioTypedefs\b
 )};
 
 our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};
···
 	"rcu_barrier_sched"			=> "rcu_barrier",
 	"get_state_synchronize_sched"		=> "get_state_synchronize_rcu",
 	"cond_synchronize_sched"		=> "cond_synchronize_rcu",
+	"kmap"					=> "kmap_local_page",
+	"kmap_atomic"				=> "kmap_local_page",
 );
 
 #Create a search pattern for all these strings to speed up a loop below
···
 				} elsif ($1 ne $email) {
 					WARN("BAD_SIGN_OFF",
 					     "Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
+				}
+			}
+		}
+
+# Check Fixes: styles is correct
+		if (!$in_header_lines &&
+		    $line =~ /^\s*fixes:?\s*(?:commit\s*)?[0-9a-f]{5,}\b/i) {
+			my $orig_commit = "";
+			my $id = "0123456789ab";
+			my $title = "commit title";
+			my $tag_case = 1;
+			my $tag_space = 1;
+			my $id_length = 1;
+			my $id_case = 1;
+			my $title_has_quotes = 0;
+
+			if ($line =~ /(\s*fixes:?)\s+([0-9a-f]{5,})\s+($balanced_parens)/i) {
+				my $tag = $1;
+				$orig_commit = $2;
+				$title = $3;
+
+				$tag_case = 0 if $tag eq "Fixes:";
+				$tag_space = 0 if ($line =~ /^fixes:? [0-9a-f]{5,} ($balanced_parens)/i);
+
+				$id_length = 0 if ($orig_commit =~ /^[0-9a-f]{12}$/i);
+				$id_case = 0 if ($orig_commit !~ /[A-F]/);
+
+				# Always strip leading/trailing parens then double quotes if existing
+				$title = substr($title, 1, -1);
+				if ($title =~ /^".*"$/) {
+					$title = substr($title, 1, -1);
+					$title_has_quotes = 1;
+				}
+			}
+
+			my ($cid, $ctitle) = git_commit_info($orig_commit, $id,
+							     $title);
+
+			if ($ctitle ne $title || $tag_case || $tag_space ||
+			    $id_length || $id_case || !$title_has_quotes) {
+				if (WARN("BAD_FIXES_TAG",
+				     "Please use correct Fixes: style 'Fixes: <12 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $cid (\"$ctitle\")'\n" . $herecurr) &&
+				    $fix) {
+					$fixed[$fixlinenr] = "Fixes: $cid (\"$ctitle\")";
 				}
 			}
 		}

scripts/decodecode

···
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 # Disassemble the Code: line in Linux oopses
 # usage: decodecode < oops.file
···
 # e.g., to decode an i386 oops on an x86_64 system, use:
 # AFLAGS=--32 decodecode < 386.oops
 # PC=hex - the PC (program counter) the oops points to
+
+faultlinenum=1
 
 cleanup() {
 	rm -f $T $T.s $T.o $T.oo $T.aa $T.dis
···
 		grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1
 }
 
+# Match the maximum number of opcode bytes from @op_bytes contained within
+# @opline
+#
+# Params:
+# @op_bytes: The string of bytes from the Code: line
+# @opline: The disassembled line coming from objdump
+#
+# Returns:
+# The max number of opcode bytes from the beginning of @op_bytes which match
+# the opcode bytes in the objdump line.
+get_substr_opcode_bytes_num()
+{
+	local op_bytes=$1
+	local opline=$2
+
+	local retval=0
+	substr=""
+
+	for opc in $op_bytes;
+	do
+		substr+="$opc"
+
+		# return if opcode bytes do not match @opline anymore
+		if ! echo $opline | grep -q "$substr";
+		then
+			break
+		fi
+
+		# add trailing space
+		substr+=" "
+		retval=$((retval+1))
+	done
+
+	return $retval
+}
+
+# Return the line number in objdump output to where the IP marker in the Code:
+# line points to
+#
+# Params:
+# @all_code: code in bytes without the marker
+# @dis_file: disassembled file
+# @ip_byte: The byte to which the IP points to
+get_faultlinenum()
+{
+	local all_code="$1"
+	local dis_file="$2"
+
+	# num bytes including IP byte
+	local num_bytes_ip=$(( $3 + 1 * $width ))
+
+	# Add the two header lines (we're counting from 1).
+	local retval=3
+
+	# remove marker
+	all_code=$(echo $all_code | sed -e 's/[<>()]//g')
+
+	while read line
+	do
+		get_substr_opcode_bytes_num "$all_code" "$line"
+		ate_opcodes=$?
+
+		if ! (( $ate_opcodes )); then
+			continue
+		fi
+
+		num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) ))
+		if (( $num_bytes_ip <= 0 )); then
+			break
+		fi
+
+		# Delete matched opcode bytes from all_code. For that, compute
+		# how many chars those opcodes are represented by and include
+		# trailing space.
+		#
+		# a byte is 2 chars, ate_opcodes is also the number of trailing
+		# spaces
+		del_chars=$(( ($ate_opcodes * $width * 2) + $ate_opcodes ))
+
+		all_code=$(echo $all_code | sed -e "s!^.\{$del_chars\}!!")
+
+		let "retval+=1"
+
+	done < $dis_file
+
+	return $retval
+}
+
 marker=`expr index "$code" "\<"`
 if [ $marker -eq 0 ]; then
 	marker=`expr index "$code" "\("`
 fi
 
-
 touch $T.oo
 if [ $marker -ne 0 ]; then
-	# 2 opcode bytes and a single space
-	pc_sub=$(( $marker / 3 ))
+	# How many bytes to subtract from the program counter
+	# in order to get to the beginning virtual address of the
+	# Code:
+	pc_sub=$(( (($marker - 1) / (2 * $width + 1)) * $width ))
 	echo All code >> $T.oo
 	echo ======== >> $T.oo
 	beforemark=`echo "$code"`
 	echo -n "	.$type 0x" > $T.s
-	echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
-	disas $T $pc_sub
-	cat $T.dis >> $T.oo
-	rm -f $T.o $T.s $T.dis
 
-# and fix code at-and-after marker
+	echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
+
+	disas $T $pc_sub
+
+	cat $T.dis >> $T.oo
+
+	get_faultlinenum "$code" "$T.dis" $pc_sub
+	faultlinenum=$?
+
+	# and fix code at-and-after marker
 	code=`echo "$code" | cut -c$((${marker} + 1))-`
+
+	rm -f $T.o $T.s $T.dis
 fi
+
 echo Code starting with the faulting instruction  > $T.aa
 echo =========================================== >> $T.aa
 code=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
···
 echo $code >> $T.s
 disas $T 0
 cat $T.dis >> $T.aa
-
-# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,
-# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is
-# special)
-faultlinenum=$(( $(wc -l $T.oo  | cut -d" " -f1) - \
-		 $(wc -l $T.aa  | cut -d" " -f1) + 3))
-
-faultline=`cat $T.dis | head -1 | cut -d":" -f2-`
-faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
 
 cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"
 echo

tools/testing/selftests/proc/.gitignore

···
 /proc-fsconfig-hidepid
 /proc-loadavg-001
 /proc-multiple-procfs
+/proc-empty-vm
 /proc-pid-vm
 /proc-self-map-files-001
 /proc-self-map-files-002

tools/testing/selftests/proc/Makefile

···
 TEST_GEN_PROGS += fd-002-posix-eq
 TEST_GEN_PROGS += fd-003-kthread
 TEST_GEN_PROGS += proc-loadavg-001
+TEST_GEN_PROGS += proc-empty-vm
 TEST_GEN_PROGS += proc-pid-vm
 TEST_GEN_PROGS += proc-self-map-files-001
 TEST_GEN_PROGS += proc-self-map-files-002

tools/testing/selftests/proc/proc-empty-vm.c

···
+/*
+ * Copyright (c) 2022 Alexey Dobriyan <[e-mail]>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/*
+ * Create a process without mappings by unmapping everything at once and
+ * holding it with ptrace(2). See what happens to
+ *
+ *	/proc/${pid}/maps
+ *	/proc/${pid}/numa_maps
+ *	/proc/${pid}/smaps
+ *	/proc/${pid}/smaps_rollup
+ */
+#undef NDEBUG
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/ptrace.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+/*
+ * 0: vsyscall VMA doesn't exist	vsyscall=none
+ * 1: vsyscall VMA is --xp		vsyscall=xonly
+ * 2: vsyscall VMA is r-xp		vsyscall=emulate
+ */
+static int g_vsyscall;
+static const char *g_proc_pid_maps_vsyscall;
+static const char *g_proc_pid_smaps_vsyscall;
+
+static const char proc_pid_maps_vsyscall_0[] = "";
+static const char proc_pid_maps_vsyscall_1[] =
+"ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]\n";
+static const char proc_pid_maps_vsyscall_2[] =
+"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]\n";
+
+static const char proc_pid_smaps_vsyscall_0[] = "";
+
+static const char proc_pid_smaps_vsyscall_1[] =
+"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]\n"
+"Size:                  4 kB\n"
+"KernelPageSize:        4 kB\n"
+"MMUPageSize:           4 kB\n"
+"Rss:                   0 kB\n"
+"Pss:                   0 kB\n"
+"Pss_Dirty:             0 kB\n"
+"Shared_Clean:          0 kB\n"
+"Shared_Dirty:          0 kB\n"
+"Private_Clean:         0 kB\n"
+"Private_Dirty:         0 kB\n"
+"Referenced:            0 kB\n"
+"Anonymous:             0 kB\n"
+"LazyFree:              0 kB\n"
+"AnonHugePages:         0 kB\n"
+"ShmemPmdMapped:        0 kB\n"
+"FilePmdMapped:         0 kB\n"
+"Shared_Hugetlb:        0 kB\n"
+"Private_Hugetlb:       0 kB\n"
+"Swap:                  0 kB\n"
+"SwapPss:               0 kB\n"
+"Locked:                0 kB\n"
+"THPeligible:    0\n"
+/*
+ * "ProtectionKey:" field is conditional. It is possible to check it as well,
+ * but I don't have such machine.
+ */
+;
+
+static const char proc_pid_smaps_vsyscall_2[] =
+"ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]\n"
+"Size:                  4 kB\n"
+"KernelPageSize:        4 kB\n"
+"MMUPageSize:           4 kB\n"
+"Rss:                   0 kB\n"
+"Pss:                   0 kB\n"
+"Pss_Dirty:             0 kB\n"
+"Shared_Clean:          0 kB\n"
+"Shared_Dirty:          0 kB\n"
+"Private_Clean:         0 kB\n"
+"Private_Dirty:         0 kB\n"
+"Referenced:            0 kB\n"
+"Anonymous:             0 kB\n"
+"LazyFree:              0 kB\n"
+"AnonHugePages:         0 kB\n"
+"ShmemPmdMapped:        0 kB\n"
+"FilePmdMapped:         0 kB\n"
+"Shared_Hugetlb:        0 kB\n"
+"Private_Hugetlb:       0 kB\n"
+"Swap:                  0 kB\n"
+"SwapPss:               0 kB\n"
+"Locked:                0 kB\n"
+"THPeligible:    0\n"
+/*
+ * "ProtectionKey:" field is conditional. It is possible to check it as well,
+ * but I'm too tired.
+ */
+;
+
+static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___)
+{
+	_exit(EXIT_FAILURE);
+}
+
+static void sigaction_SIGSEGV_vsyscall(int _, siginfo_t *__, void *___)
+{
+	_exit(g_vsyscall);
+}
+
+/*
+ * vsyscall page can't be unmapped, probe it directly.
+ */
+static void vsyscall(void)
+{
+	pid_t pid;
+	int wstatus;
+
+	pid = fork();
+	if (pid < 0) {
+		fprintf(stderr, "fork, errno %d\n", errno);
+		exit(1);
+	}
+	if (pid == 0) {
+		setrlimit(RLIMIT_CORE, &(struct rlimit){});
+
+		/* Hide "segfault at ffffffffff600000" messages. */
+		struct sigaction act = {};
+		act.sa_flags = SA_SIGINFO;
+		act.sa_sigaction = sigaction_SIGSEGV_vsyscall;
+		sigaction(SIGSEGV, &act, NULL);
+
+		g_vsyscall = 0;
+		/* gettimeofday(NULL, NULL); */
+		asm volatile (
+			"call %P0"
+			:
+			: "i" (0xffffffffff600000), "D" (NULL), "S" (NULL)
+			: "rax", "rcx", "r11"
+		);
+
+		g_vsyscall = 1;
+		*(volatile int *)0xffffffffff600000UL;
+
+		g_vsyscall = 2;
+		exit(g_vsyscall);
+	}
+	waitpid(pid, &wstatus, 0);
+	if (WIFEXITED(wstatus)) {
+		g_vsyscall = WEXITSTATUS(wstatus);
+	} else {
+		fprintf(stderr, "error: vsyscall wstatus %08x\n", wstatus);
+		exit(1);
+	}
+}
+
+static int test_proc_pid_maps(pid_t pid)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "/proc/%u/maps", pid);
+	int fd = open(buf, O_RDONLY);
+	if (fd == -1) {
+		perror("open /proc/${pid}/maps");
+		return EXIT_FAILURE;
+	} else {
+		ssize_t rv = read(fd, buf, sizeof(buf));
+		close(fd);
+		if (g_vsyscall == 0) {
+			assert(rv == 0);
+		} else {
+			size_t len = strlen(g_proc_pid_maps_vsyscall);
+			assert(rv == len);
+			assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0);
+		}
+		return EXIT_SUCCESS;
+	}
+}
+
+static int test_proc_pid_numa_maps(pid_t pid)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "/proc/%u/numa_maps", pid);
+	int fd = open(buf, O_RDONLY);
+	if (fd == -1) {
+		if (errno == ENOENT) {
+			/*
+			 * /proc/${pid}/numa_maps is under CONFIG_NUMA,
+			 * it doesn't necessarily exist.
+			 */
+			return EXIT_SUCCESS;
+		}
+		perror("open /proc/${pid}/numa_maps");
+		return EXIT_FAILURE;
+	} else {
+		ssize_t rv = read(fd, buf, sizeof(buf));
+		close(fd);
+		assert(rv == 0);
+		return EXIT_SUCCESS;
+	}
+}
+
+static int test_proc_pid_smaps(pid_t pid)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "/proc/%u/smaps", pid);
+	int fd = open(buf, O_RDONLY);
+	if (fd == -1) {
+		if (errno == ENOENT) {
+			/*
+			 * /proc/${pid}/smaps is under CONFIG_PROC_PAGE_MONITOR,
+			 * it doesn't necessarily exist.
+			 */
+			return EXIT_SUCCESS;
+		}
+		perror("open /proc/${pid}/smaps");
+		return EXIT_FAILURE;
+	} else {
+		ssize_t rv = read(fd, buf, sizeof(buf));
+		close(fd);
+		if (g_vsyscall == 0) {
+			assert(rv == 0);
+		} else {
+			size_t len = strlen(g_proc_pid_maps_vsyscall);
+			/* TODO "ProtectionKey:" */
+			assert(rv > len);
+			assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0);
+		}
+		return EXIT_SUCCESS;
+	}
+}
+
+static const char g_smaps_rollup[] =
+"00000000-00000000 ---p 00000000 00:00 0                                  [rollup]\n"
+"Rss:                   0 kB\n"
+"Pss:                   0 kB\n"
+"Pss_Dirty:             0 kB\n"
+"Pss_Anon:              0 kB\n"
+"Pss_File:              0 kB\n"
+"Pss_Shmem:             0 kB\n"
+"Shared_Clean:          0 kB\n"
+"Shared_Dirty:          0 kB\n"
+"Private_Clean:         0 kB\n"
+"Private_Dirty:         0 kB\n"
+"Referenced:            0 kB\n"
+"Anonymous:             0 kB\n"
+"LazyFree:              0 kB\n"
+"AnonHugePages:         0 kB\n"
+"ShmemPmdMapped:        0 kB\n"
+"FilePmdMapped:         0 kB\n"
+"Shared_Hugetlb:        0 kB\n"
+"Private_Hugetlb:       0 kB\n"
+"Swap:                  0 kB\n"
+"SwapPss:               0 kB\n"
+"Locked:                0 kB\n"
+;
+
+static int test_proc_pid_smaps_rollup(pid_t pid)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "/proc/%u/smaps_rollup", pid);
+	int fd = open(buf, O_RDONLY);
+	if (fd == -1) {
+		if (errno == ENOENT) {
+			/*
+			 * /proc/${pid}/smaps_rollup is under CONFIG_PROC_PAGE_MONITOR,
+			 * it doesn't necessarily exist.
+			 */
+			return EXIT_SUCCESS;
+		}
+		perror("open /proc/${pid}/smaps_rollup");
+		return EXIT_FAILURE;
+	} else {
+		ssize_t rv = read(fd, buf, sizeof(buf));
+		close(fd);
+		assert(rv == sizeof(g_smaps_rollup) - 1);
+		assert(memcmp(buf, g_smaps_rollup, sizeof(g_smaps_rollup) - 1) == 0);
+		return EXIT_SUCCESS;
+	}
+}
+
+int main(void)
+{
+	int rv = EXIT_SUCCESS;
+
+	vsyscall();
+
+	switch (g_vsyscall) {
+	case 0:
+		g_proc_pid_maps_vsyscall  = proc_pid_maps_vsyscall_0;
+		g_proc_pid_smaps_vsyscall = proc_pid_smaps_vsyscall_0;
+		break;
+	case 1:
+		g_proc_pid_maps_vsyscall  = proc_pid_maps_vsyscall_1;
+		g_proc_pid_smaps_vsyscall = proc_pid_smaps_vsyscall_1;
+		break;
+	case 2:
+		g_proc_pid_maps_vsyscall  = proc_pid_maps_vsyscall_2;
+		g_proc_pid_smaps_vsyscall = proc_pid_smaps_vsyscall_2;
+		break;
+	default:
+		abort();
+	}
+
+	pid_t pid = fork();
+	if (pid == -1) {
+		perror("fork");
+		return EXIT_FAILURE;
+	} else if (pid == 0) {
+		rv = ptrace(PTRACE_TRACEME, 0, NULL, NULL);
+		if (rv != 0) {
+			if (errno == EPERM) {
+				fprintf(stderr,
+"Did you know? ptrace(PTRACE_TRACEME) doesn't work under strace.\n"
+				);
+				kill(getppid(), SIGTERM);
+				return EXIT_FAILURE;
+			}
+			perror("ptrace PTRACE_TRACEME");
+			return EXIT_FAILURE;
+		}
+
+		/*
+		 * Hide "segfault at ..." messages. Signal handler won't run.
+		 */
+		struct sigaction act = {};
+		act.sa_flags = SA_SIGINFO;
+		act.sa_sigaction = sigaction_SIGSEGV;
+		sigaction(SIGSEGV, &act, NULL);
+
+#ifdef __amd64__
+		munmap(NULL, ((size_t)1 << 47) - 4096);
+#else
+#error "implement 'unmap everything'"
+#endif
+		return EXIT_FAILURE;
+	} else {
+		/*
+		 * TODO find reliable way to signal parent that munmap(2) completed.
+		 * Child can't do it directly because it effectively doesn't exist
+		 * anymore. Looking at child's VM files isn't 100% reliable either:
+		 * due to a bug they may not become empty or empty-like.
+		 */
+		sleep(1);
+
+		if (rv == EXIT_SUCCESS) {
+			rv = test_proc_pid_maps(pid);
+		}
+		if (rv == EXIT_SUCCESS) {
+			rv = test_proc_pid_numa_maps(pid);
+		}
+		if (rv == EXIT_SUCCESS) {
+			rv = test_proc_pid_smaps(pid);
+		}
+		if (rv == EXIT_SUCCESS) {
+			rv = test_proc_pid_smaps_rollup(pid);
+		}
+		/*
+		 * TODO test /proc/${pid}/statm, task_statm()
+		 * ->start_code, ->end_code aren't updated by munmap().
+		 * Output can be "0 0 0 2 0 0 0\n" where "2" can be anything.
+		 */
+
+		/* Cut the rope. */
+		int wstatus;
+		waitpid(pid, &wstatus, 0);
+		assert(WIFSTOPPED(wstatus));
+		assert(WSTOPSIG(wstatus) == SIGSEGV);
+	}
+
+	return rv;
+}

tools/testing/selftests/proc/proc-pid-vm.c

···
 
 /*
  * 0: vsyscall VMA doesn't exist	vsyscall=none
- * 1: vsyscall VMA is r-xp		vsyscall=emulate
- * 2: vsyscall VMA is --xp		vsyscall=xonly
+ * 1: vsyscall VMA is --xp		vsyscall=xonly
+ * 2: vsyscall VMA is r-xp		vsyscall=emulate
  */
-static int g_vsyscall;
+static volatile int g_vsyscall;
 static const char *str_vsyscall;
 
 static const char str_vsyscall_0[] = "";
 static const char str_vsyscall_1[] =
-"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]\n";
-static const char str_vsyscall_2[] =
 "ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]\n";
+static const char str_vsyscall_2[] =
+"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]\n";
 
 #ifdef __x86_64__
 static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___)
 {
-	_exit(1);
+	_exit(g_vsyscall);
 }
 
 /*
···
 		act.sa_sigaction = sigaction_SIGSEGV;
 		(void)sigaction(SIGSEGV, &act, NULL);
 
+		g_vsyscall = 0;
 		/* gettimeofday(NULL, NULL); */
 		asm volatile (
 			"call %P0"
···
 			: "i" (0xffffffffff600000), "D" (NULL), "S" (NULL)
 			: "rax", "rcx", "r11"
 		);
-		exit(0);
+
+		g_vsyscall = 1;
+		*(volatile int *)0xffffffffff600000UL;
+
+		g_vsyscall = 2;
+		exit(g_vsyscall);
 	}
 	waitpid(pid, &wstatus, 0);
-	if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0) {
-		/* vsyscall page exists and is executable. */
+	if (WIFEXITED(wstatus)) {
+		g_vsyscall = WEXITSTATUS(wstatus);
 	} else {
-		/* vsyscall page doesn't exist. */
-		g_vsyscall = 0;
-		return;
-	}
-
-	pid = fork();
-	if (pid < 0) {
-		fprintf(stderr, "fork, errno %d\n", errno);
+		fprintf(stderr, "error: wstatus %08x\n", wstatus);
 		exit(1);
 	}
-	if (pid == 0) {
-		struct rlimit rlim = {0, 0};
-		(void)setrlimit(RLIMIT_CORE, &rlim);
-
-		/* Hide "segfault at ffffffffff600000" messages. */
-		struct sigaction act;
-		memset(&act, 0, sizeof(struct sigaction));
-		act.sa_flags = SA_SIGINFO;
-		act.sa_sigaction = sigaction_SIGSEGV;
-		(void)sigaction(SIGSEGV, &act, NULL);
-
-		*(volatile int *)0xffffffffff600000UL;
-		exit(0);
-	}
-	waitpid(pid, &wstatus, 0);
-	if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0) {
-		/* vsyscall page is readable and executable. */
-		g_vsyscall = 1;
-		return;
-	}
-
-	/* vsyscall page is executable but unreadable. */
-	g_vsyscall = 2;
 }
 
 int main(void)

usr/gen_init_cpio.c

···
 	char s[256];
 	struct stat buf;
 	unsigned long size;
-	int file = -1;
+	int file;
 	int retval;
 	int rc = -1;
 	int namesize;