Merge tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

- Remove the deprecated rule to build *.dtbo from *.dts

- Refactor section mismatch detection in modpost

- Fix bogus ARM section mismatch detections

- Fix error of 'make gtags' with O= option

- Add Clang's target triple to KBUILD_CPPFLAGS to fix a build error
with the latest LLVM version

- Rebuild the built-in initrd when KBUILD_BUILD_TIMESTAMP is changed

- Ignore more compiler-generated symbols for kallsyms

- Fix 'make local*config' to handle the ${CONFIG_FOO} form in Makefiles

- Enable more kernel-doc warnings with W=2

- Refactor <linux/export.h> by generating KSYMTAB data by modpost

- Deprecate <asm/export.h> and <asm-generic/export.h>

- Remove the EXPORT_DATA_SYMBOL macro

- Move the check for static EXPORT_SYMBOL back to modpost, which makes
the build faster

- Re-implement CONFIG_TRIM_UNUSED_KSYMS with one-pass algorithm

- Warn missing MODULE_DESCRIPTION when building modules with W=1

- Make 'make clean' robust against too long argument error

- Exclude more objects from GCOV to fix CFI failures with GCOV

- Allow 'make modules_install' to install modules.builtin and
modules.builtin.modinfo even when CONFIG_MODULES is disabled

- Include modules.builtin and modules.builtin.modinfo in the
linux-image Debian package even when CONFIG_MODULES is disabled

- Revive "Entering directory" logging for the latest Make version

* tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (72 commits)
modpost: define more R_ARM_* for old distributions
kbuild: revive "Entering directory" for Make >= 4.4.1
kbuild: set correct abs_srctree and abs_objtree for package builds
scripts/mksysmap: Ignore prefixed KCFI symbols
kbuild: deb-pkg: remove the CONFIG_MODULES check in buildeb
kbuild: builddeb: always make modules_install, to install modules.builtin*
modpost: continue even with unknown relocation type
modpost: factor out Elf_Sym pointer calculation to section_rel()
modpost: factor out inst location calculation to section_rel()
kbuild: Disable GCOV for *.mod.o
kbuild: Fix CFI failures with GCOV
kbuild: make clean rule robust against too long argument error
script: modpost: emit a warning when the description is missing
kbuild: make modules_install copy modules.builtin(.modinfo)
linux/export.h: rename 'sec' argument to 'license'
modpost: show offset from symbol for section mismatch warnings
modpost: merge two similar section mismatch warnings
kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion
modpost: use null string instead of NULL pointer for default namespace
modpost: squash sym_update_namespace() into sym_add_exported()
...

.gitignore

···
 *.symversions
 *.tab.[ch]
 *.tar
-*.usyms
 *.xz
 *.zst
 Module.symvers
···
 #
 /include/config/
 /include/generated/
-/include/ksym/
 /arch/*/include/generated/
 
 # stgit generated dirs

Documentation/kbuild/kbuild.rst

···
 The value of KBUILD_DEBARCH is assumed (not checked) to be a valid Debian
 architecture.
 
+KDOCFLAGS
+---------
+Specify extra (warning/error) flags for kernel-doc checks during the build,
+see scripts/kernel-doc for which flags are supported. Note that this doesn't
+(currently) apply to documentation builds.
+
 ARCH
 ----
 Set ARCH to the architecture to be built.

Documentation/process/changes.rst

···
 bc                     1.06.95          bc --version
 Sphinx\ [#f1]_         1.7              sphinx-build --version
 cpio                   any              cpio --version
+GNU tar                1.28             tar --version
+gtags (optional)       6.6.5            gtags --version
 ====================== ===============  ========================================
 
 .. [#f1] Sphinx is needed only to build the Kernel documentation
···
 enabled.  You will also need openssl development packages to build kernels 4.3
 and higher.
 
+Tar
+---
+
+GNU tar is needed if you want to enable access to the kernel headers via sysfs
+(CONFIG_IKHEADERS).
+
+gtags / GNU GLOBAL (optional)
+-----------------------------
+
+The kernel build requires GNU GLOBAL version 6.6.5 or later to generate
+tag files through ``make gtags``.  This is due to its use of the gtags
+``-C (--directory)`` flag.
 
 System utilities
 ****************

Makefile

···
 # descending is started. They are now explicitly listed as the
 # prepare rule.
 
+this-makefile := $(lastword $(MAKEFILE_LIST))
+export abs_srctree := $(realpath $(dir $(this-makefile)))
+export abs_objtree := $(CURDIR)
+
 ifneq ($(sub_make_done),1)
 
 # Do not use make's built-in rules and variables
···
 
 # $(realpath ...) resolves symlinks
 abs_objtree := $(realpath $(abs_objtree))
-else
-abs_objtree := $(CURDIR)
 endif # ifneq ($(KBUILD_OUTPUT),)
-
-ifeq ($(abs_objtree),$(CURDIR))
-# Suppress "Entering directory ..." unless we are changing the work directory.
-MAKEFLAGS += --no-print-directory
-else
-need-sub-make := 1
-endif
-
-this-makefile := $(lastword $(MAKEFILE_LIST))
-abs_srctree := $(realpath $(dir $(this-makefile)))
 
 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 $(error source directory cannot contain spaces or colons)
···
 $(this-makefile): ;
 endif
 
-export abs_srctree abs_objtree
 export sub_make_done := 1
+
+endif # sub_make_done
+
+ifeq ($(abs_objtree),$(CURDIR))
+# Suppress "Entering directory ..." if we are at the final work directory.
+no-print-directory := --no-print-directory
+else
+# Recursion to show "Entering directory ..."
+need-sub-make := 1
+endif
+
+ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
+# If --no-print-directory is unset, recurse once again to set it.
+# You may end up recursing into __sub-make twice. This is needed due to the
+# behavior change in GNU Make 4.4.1.
+need-sub-make := 1
+endif
 
 ifeq ($(need-sub-make),1)
 
···
 
 # Invoke a second make in the output directory, passing relevant variables
 __sub-make:
-	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
+	$(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
+	-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 
-endif # need-sub-make
-endif # sub_make_done
+else # need-sub-make
 
 # We process the rest of the Makefile if this is the final invocation of make
-ifeq ($(need-sub-make),)
-
-# Do not print "Entering directory ...",
-# but we want to display it when entering to the output directory
-# so that IDEs/editors are able to understand relative filenames.
-MAKEFLAGS += --no-print-directory
 
 ifeq ($(abs_srctree),$(abs_objtree))
         # building in the source tree
···
 export KBUILD_VMLINUX_LIBS
 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 
-# Recurse until adjust_autoksyms.sh is satisfied
-PHONY += autoksyms_recursive
 ifdef CONFIG_TRIM_UNUSED_KSYMS
 # For the kernel to actually contain only the needed exported symbols,
 # we have to build modules as well to determine what those symbols are.
-# (this can be evaluated only once include/config/auto.conf has been included)
 KBUILD_MODULES := 1
-
-autoksyms_recursive: $(build-dir) modules.order
-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
-	  "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
 endif
-
-autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
-
-quiet_cmd_autoksyms_h = GEN     $@
-      cmd_autoksyms_h = mkdir -p $(dir $@); \
-			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
-
-$(autoksyms_h):
-	$(call cmd,autoksyms_h)
 
 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
 quiet_cmd_ar_vmlinux.a = AR      $@
···
 	$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
 
 targets += vmlinux.a
-vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
+vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
 	$(call if_changed,ar_vmlinux.a)
 
 PHONY += vmlinux_o
···
 PHONY += prepare archprepare
 
 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
-	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
+	asm-generic $(version_h) include/generated/utsrelease.h \
 	include/generated/compile.h include/generated/autoconf.h remove-stale-files
 
 prepare0: archprepare
···
 endif
 endif
 
+endif # CONFIG_MODULES
+
 modinst_pre :=
 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 modinst_pre := __modinst_pre
···
 __modinst_pre:
 	@rm -rf $(MODLIB)/kernel
 	@rm -f $(MODLIB)/source
-	@mkdir -p $(MODLIB)/kernel
+	@mkdir -p $(MODLIB)
+ifdef CONFIG_MODULES
 	@ln -s $(abspath $(srctree)) $(MODLIB)/source
 	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 		rm -f $(MODLIB)/build ; \
 		ln -s $(CURDIR) $(MODLIB)/build ; \
 	fi
 	@sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
+endif
 	@cp -f modules.builtin $(MODLIB)/
 	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
-
-endif # CONFIG_MODULES
 
 ###
 # Cleaning is done on three levels.
···
 	@echo  '  clean           - remove generated files in module directory only'
 	@echo  ''
 
+__external_modules_error:
+	@echo >&2 '***'
+	@echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
+	@echo >&2 '*** You cannot build or install external modules.'
+	@echo >&2 '***'
+	@false
+
 endif # KBUILD_EXTMOD
 
 # ---------------------------------------------------------------------------
···
 # Modules not configured
 # ---------------------------------------------------------------------------
 
-modules modules_install:
-	@echo >&2 '***'
-	@echo >&2 '*** The present kernel configuration has modules disabled.'
-	@echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
-	@echo >&2 '*** to enable CONFIG_MODULES.'
-	@echo >&2 '***'
-	@exit 1
+PHONY += __external_modules_error
+
+modules modules_install: __external_modules_error
+	@:
 
 KBUILD_MODULES :=
 
···
 		-o -name '*.dtb.S' -o -name '*.dtbo.S' \
 		-o -name '*.dt.yaml' \
 		-o -name '*.dwo' -o -name '*.lst' \
-		-o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
+		-o -name '*.su' -o -name '*.mod' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
 		-o -name '*.asn1.[ch]' \

arch/arc/include/asm/linkage.h

···
 
 #include <asm/dwarf.h>
 
+#define ASM_NL		 `	/* use '`' to mark new line in macro */
+#define __ALIGN		.align 4
+#define __ALIGN_STR	__stringify(__ALIGN)
+
 #ifdef __ASSEMBLY__
 
 .macro ST2 e, o, off
···
 	ld	\o, [sp, \off+4]
 #endif
 .endm
-
-#define ASM_NL		 `	/* use '`' to mark new line in macro */
-#define __ALIGN		.align 4
-#define __ALIGN_STR	__stringify(__ALIGN)
 
 /* annotation for data we want in DCCM - if enabled in .config */
 .macro ARCFP_DATA nm

arch/ia64/include/asm/Kbuild

···
 # SPDX-License-Identifier: GPL-2.0
 generated-y += syscall_table.h
 generic-y += agp.h
+generic-y += export.h
 generic-y += kvm_para.h
 generic-y += mcs_spinlock.h
 generic-y += vtime.h

arch/ia64/include/asm/export.h

···
-/* EXPORT_DATA_SYMBOL != EXPORT_SYMBOL here */
-#define KSYM_FUNC(name) @fptr(name)
-#include <asm-generic/export.h>

arch/ia64/kernel/head.S

···
 	__PAGE_ALIGNED_DATA
 
 	.global empty_zero_page
-EXPORT_DATA_SYMBOL_GPL(empty_zero_page)
+EXPORT_SYMBOL_GPL(empty_zero_page)
 empty_zero_page:
 	.skip PAGE_SIZE
 

arch/ia64/kernel/ivt.S

···
 
 	.align 32768	// align on 32KB boundary
 	.global ia64_ivt
-	EXPORT_DATA_SYMBOL(ia64_ivt)
+	EXPORT_SYMBOL(ia64_ivt)
 ia64_ivt:
 /////////////////////////////////////////////////////////////////////////////////////////
 // 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)

arch/mips/Makefile

···
 KBUILD_LDFLAGS		+= -m $(ld-emul)
 
 ifdef CONFIG_MIPS
-CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
+CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 	grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 endif

arch/powerpc/kernel/vdso/Makefile

···
 KCSAN_SANITIZE := n
 
 ccflags-y := -fno-common -fno-builtin
-ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack
+ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
 ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
 ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
 

arch/um/os-Linux/user_syms.c

···
 EXPORT_SYMBOL(vsyscall_end);
 #endif
 
-/* Export symbols used by GCC for the stack protector. */
-extern void __stack_smash_handler(void *) __attribute__((weak));
-EXPORT_SYMBOL(__stack_smash_handler);
-
-extern long __guard __attribute__((weak));
-EXPORT_SYMBOL(__guard);
-
 #ifdef _FORTIFY_SOURCE
 extern int __sprintf_chk(char *str, int flag, size_t len, const char *format);
 EXPORT_SYMBOL(__sprintf_chk);

include/asm-generic/export.h

···
 #define __ASM_GENERIC_EXPORT_H
 
 /*
- * This comment block is used by fixdep. Please do not remove.
- *
- * When CONFIG_MODVERSIONS is changed from n to y, all source files having
- * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
- * side effect of the *.o build rule.
+ * <asm/export.h> and <asm-generic/export.h> are deprecated.
+ * Please include <linux/export.h> directly.
  */
-
-#ifndef KSYM_FUNC
-#define KSYM_FUNC(x) x
-#endif
-#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
-#define KSYM_ALIGN 4
-#elif defined(CONFIG_64BIT)
-#define KSYM_ALIGN 8
-#else
-#define KSYM_ALIGN 4
-#endif
-
-.macro __put, val, name
-#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
-	.long	\val - ., \name - ., 0
-#elif defined(CONFIG_64BIT)
-	.quad	\val, \name, 0
-#else
-	.long	\val, \name, 0
-#endif
-.endm
-
-/*
- * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
- * section flag requires it. Use '%progbits' instead of '@progbits' since the
- * former apparently works on all arches according to the binutils source.
- */
-
-.macro ___EXPORT_SYMBOL name,val,sec
-#if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
-	.section ___ksymtab\sec+\name,"a"
-	.balign KSYM_ALIGN
-__ksymtab_\name:
-	__put \val, __kstrtab_\name
-	.previous
-	.section __ksymtab_strings,"aMS",%progbits,1
-__kstrtab_\name:
-	.asciz "\name"
-	.previous
-#endif
-.endm
-
-#if defined(CONFIG_TRIM_UNUSED_KSYMS)
-
-#include <linux/kconfig.h>
-#include <generated/autoksyms.h>
-
-.macro __ksym_marker sym
-	.section ".discard.ksym","a"
-__ksym_marker_\sym:
-	 .previous
-.endm
-
-#define __EXPORT_SYMBOL(sym, val, sec)				\
-	__ksym_marker sym;					\
-	__cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
-#define __cond_export_sym(sym, val, sec, conf)			\
-	___cond_export_sym(sym, val, sec, conf)
-#define ___cond_export_sym(sym, val, sec, enabled)		\
-	__cond_export_sym_##enabled(sym, val, sec)
-#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
-#define __cond_export_sym_0(sym, val, sec) /* nothing */
-
-#else
-#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
-#endif
-
-#define EXPORT_SYMBOL(name)					\
-	__EXPORT_SYMBOL(name, KSYM_FUNC(name),)
-#define EXPORT_SYMBOL_GPL(name) 				\
-	__EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
-#define EXPORT_DATA_SYMBOL(name)				\
-	__EXPORT_SYMBOL(name, name,)
-#define EXPORT_DATA_SYMBOL_GPL(name)				\
-	__EXPORT_SYMBOL(name, name,_gpl)
+#include <linux/export.h>
 
 #endif

include/asm-generic/vmlinux.lds.h

···
 	PATCHABLE_DISCARDS						\
 	*(.discard)							\
 	*(.discard.*)							\
+	*(.export_symbol)						\
 	*(.modinfo)							\
 	/* ld.bfd warns about .gnu.version* even when not emitted */	\
 	*(.gnu.version*)						\

include/linux/export-internal.h

···
 #include <linux/compiler.h>
 #include <linux/types.h>
 
+#if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)
+/*
+ * relative reference: this reduces the size by half on 64-bit architectures,
+ * and eliminates the need for absolute relocations that require runtime
+ * processing on relocatable kernels.
+ */
+#define __KSYM_REF(sym)		".long " #sym "- ."
+#elif defined(CONFIG_64BIT)
+#define __KSYM_REF(sym)		".quad " #sym
+#else
+#define __KSYM_REF(sym)		".long " #sym
+#endif
+
+/*
+ * For every exported symbol, do the following:
+ *
+ * - Put the name of the symbol and namespace (empty string "" for none) in
+ *   __ksymtab_strings.
+ * - Place a struct kernel_symbol entry in the __ksymtab section.
+ *
+ * Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
+ * section flag requires it. Use '%progbits' instead of '@progbits' since the
+ * former apparently works on all arches according to the binutils source.
+ */
+#define __KSYMTAB(name, sym, sec, ns)						\
+	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1"	"\n"	\
+	    "__kstrtab_" #name ":"					"\n"	\
+	    "	.asciz \"" #name "\""					"\n"	\
+	    "__kstrtabns_" #name ":"					"\n"	\
+	    "	.asciz \"" ns "\""					"\n"	\
+	    "	.previous"						"\n"	\
+	    "	.section \"___ksymtab" sec "+" #name "\", \"a\""	"\n"	\
+	    "	.balign	4"						"\n"	\
+	    "__ksymtab_" #name ":"					"\n"	\
+		__KSYM_REF(sym)						"\n"	\
+		__KSYM_REF(__kstrtab_ ##name)				"\n"	\
+		__KSYM_REF(__kstrtabns_ ##name)				"\n"	\
+	    "	.previous"						"\n"	\
+	)
+
+#ifdef CONFIG_IA64
+#define KSYM_FUNC(name)		@fptr(name)
+#else
+#define KSYM_FUNC(name)		name
+#endif
+
+#define KSYMTAB_FUNC(name, sec, ns)	__KSYMTAB(name, KSYM_FUNC(name), sec, ns)
+#define KSYMTAB_DATA(name, sec, ns)	__KSYMTAB(name, name, sec, ns)
+
 #define SYMBOL_CRC(sym, crc, sec)   \
 	asm(".section \"___kcrctab" sec "+" #sym "\",\"a\""	"\n" \
 	    "__crc_" #sym ":"					"\n" \

include/linux/export.h

···
 #ifndef _LINUX_EXPORT_H
 #define _LINUX_EXPORT_H
 
+#include <linux/compiler.h>
+#include <linux/linkage.h>
 #include <linux/stringify.h>
 
 /*
···
 #else
 #define THIS_MODULE ((struct module *)0)
 #endif
+#endif /* __ASSEMBLY__ */
 
-#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
-#include <linux/compiler.h>
-/*
- * Emit the ksymtab entry as a pair of relative references: this reduces
- * the size by half on 64-bit architectures, and eliminates the need for
- * absolute relocations that require runtime processing on relocatable
- * kernels.
- */
-#define __KSYMTAB_ENTRY(sym, sec)					\
-	__ADDRESSABLE(sym)						\
-	asm("	.section \"___ksymtab" sec "+" #sym "\", \"a\"	\n"	\
-	    "	.balign	4					\n"	\
-	    "__ksymtab_" #sym ":				\n"	\
-	    "	.long	" #sym "- .				\n"	\
-	    "	.long	__kstrtab_" #sym "- .			\n"	\
-	    "	.long	__kstrtabns_" #sym "- .			\n"	\
-	    "	.previous					\n")
-
-struct kernel_symbol {
-	int value_offset;
-	int name_offset;
-	int namespace_offset;
-};
+#ifdef CONFIG_64BIT
+#define __EXPORT_SYMBOL_REF(sym)			\
+	.balign 8				ASM_NL	\
+	.quad sym
 #else
-#define __KSYMTAB_ENTRY(sym, sec)					\
-	static const struct kernel_symbol __ksymtab_##sym		\
-	__attribute__((section("___ksymtab" sec "+" #sym), used))	\
-	__aligned(sizeof(void *))					\
-	= { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
-
-struct kernel_symbol {
-	unsigned long value;
-	const char *name;
-	const char *namespace;
-};
+#define __EXPORT_SYMBOL_REF(sym)			\
+	.balign 4				ASM_NL	\
+	.long sym
 #endif
 
-#ifdef __GENKSYMS__
-
-#define ___EXPORT_SYMBOL(sym, sec, ns)	__GENKSYMS_EXPORT_SYMBOL(sym)
-
-#else
-
-/*
- * For every exported symbol, do the following:
- *
- * - Put the name of the symbol and namespace (empty string "" for none) in
- *   __ksymtab_strings.
- * - Place a struct kernel_symbol entry in the __ksymtab section.
- *
- * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
- * section flag requires it. Use '%progbits' instead of '@progbits' since the
- * former apparently works on all arches according to the binutils source.
- */
-#define ___EXPORT_SYMBOL(sym, sec, ns)						\
-	extern typeof(sym) sym;							\
-	extern const char __kstrtab_##sym[];					\
-	extern const char __kstrtabns_##sym[];					\
-	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1	\n"	\
-	    "__kstrtab_" #sym ":					\n"	\
-	    "	.asciz 	\"" #sym "\"					\n"	\
-	    "__kstrtabns_" #sym ":					\n"	\
-	    "	.asciz 	\"" ns "\"					\n"	\
-	    "	.previous						\n");	\
-	__KSYMTAB_ENTRY(sym, sec)
-
-#endif
+#define ___EXPORT_SYMBOL(sym, license, ns)		\
+	.section ".export_symbol","a"		ASM_NL	\
+	__export_symbol_##sym:			ASM_NL	\
+		.asciz license			ASM_NL	\
+		.asciz ns			ASM_NL	\
+		__EXPORT_SYMBOL_REF(sym)	ASM_NL	\
+	.previous
 
 #if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
 
···
  * be reused in other execution contexts such as the UEFI stub or the
  * decompressor.
  */
-#define __EXPORT_SYMBOL(sym, sec, ns)
+#define __EXPORT_SYMBOL(sym, license, ns)
 
-#elif defined(CONFIG_TRIM_UNUSED_KSYMS)
+#elif defined(__GENKSYMS__)
 
-#include <generated/autoksyms.h>
+#define __EXPORT_SYMBOL(sym, license, ns)	__GENKSYMS_EXPORT_SYMBOL(sym)
 
-/*
- * For fine grained build dependencies, we want to tell the build system
- * about each possible exported symbol even if they're not actually exported.
- * We use a symbol pattern __ksym_marker_<symbol> that the build system filters
- * from the $(NM) output (see scripts/gen_ksymdeps.sh). These symbols are
- * discarded in the final link stage.
- */
-#define __ksym_marker(sym)	\
-	static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
+#elif defined(__ASSEMBLY__)
 
-#define __EXPORT_SYMBOL(sym, sec, ns)					\
-	__ksym_marker(sym);						\
-	__cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
-#define __cond_export_sym(sym, sec, ns, conf)				\
-	___cond_export_sym(sym, sec, ns, conf)
-#define ___cond_export_sym(sym, sec, ns, enabled)			\
-	__cond_export_sym_##enabled(sym, sec, ns)
-#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
-
-#ifdef __GENKSYMS__
-#define __cond_export_sym_0(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
-#else
-#define __cond_export_sym_0(sym, sec, ns) /* nothing */
-#endif
+#define __EXPORT_SYMBOL(sym, license, ns) \
+	___EXPORT_SYMBOL(sym, license, ns)
 
 #else
 
-#define __EXPORT_SYMBOL(sym, sec, ns)	___EXPORT_SYMBOL(sym, sec, ns)
+#define __EXPORT_SYMBOL(sym, license, ns)			\
+	extern typeof(sym) sym;					\
+	__ADDRESSABLE(sym)					\
+	asm(__stringify(___EXPORT_SYMBOL(sym, license, ns)))
 
 #endif /* CONFIG_MODULES */
 
 #ifdef DEFAULT_SYMBOL_NAMESPACE
-#define _EXPORT_SYMBOL(sym, sec)	__EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE))
+#define _EXPORT_SYMBOL(sym, license)	__EXPORT_SYMBOL(sym, license, __stringify(DEFAULT_SYMBOL_NAMESPACE))
 #else
-#define _EXPORT_SYMBOL(sym, sec)	__EXPORT_SYMBOL(sym, sec, "")
+#define _EXPORT_SYMBOL(sym, license)	__EXPORT_SYMBOL(sym, license, "")
 #endif
 
 #define EXPORT_SYMBOL(sym)		_EXPORT_SYMBOL(sym, "")
-#define EXPORT_SYMBOL_GPL(sym)		_EXPORT_SYMBOL(sym, "_gpl")
+#define EXPORT_SYMBOL_GPL(sym)		_EXPORT_SYMBOL(sym, "GPL")
 #define EXPORT_SYMBOL_NS(sym, ns)	__EXPORT_SYMBOL(sym, "", __stringify(ns))
-#define EXPORT_SYMBOL_NS_GPL(sym, ns)	__EXPORT_SYMBOL(sym, "_gpl", __stringify(ns))
-
-#endif /* !__ASSEMBLY__ */
+#define EXPORT_SYMBOL_NS_GPL(sym, ns)	__EXPORT_SYMBOL(sym, "GPL", __stringify(ns))
 
 #endif /* _LINUX_EXPORT_H */

include/linux/pm.h

···
 }
 
 #ifdef CONFIG_PM
-#define _EXPORT_DEV_PM_OPS(name, sec, ns)				\
+#define _EXPORT_DEV_PM_OPS(name, license, ns)				\
 	const struct dev_pm_ops name;					\
-	__EXPORT_SYMBOL(name, sec, ns);					\
+	__EXPORT_SYMBOL(name, license, ns);				\
 	const struct dev_pm_ops name
 #define EXPORT_PM_FN_GPL(name)		EXPORT_SYMBOL_GPL(name)
 #define EXPORT_PM_FN_NS_GPL(name, ns)	EXPORT_SYMBOL_NS_GPL(name, ns)
 #else
-#define _EXPORT_DEV_PM_OPS(name, sec, ns)				\
+#define _EXPORT_DEV_PM_OPS(name, license, ns)				\
 	static __maybe_unused const struct dev_pm_ops __static_##name
 #define EXPORT_PM_FN_GPL(name)
 #define EXPORT_PM_FN_NS_GPL(name, ns)
 #endif
 
 #define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
-#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "_gpl", "")
+#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "GPL", "")
 #define EXPORT_NS_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "", #ns)
-#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "_gpl", #ns)
+#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "GPL", #ns)
 
 /*
  * Use this if you want to use the same suspend and resume callbacks for suspend

init/Makefile

···
 $(obj)/version-timestamp.o: include/generated/utsversion.h
 CFLAGS_version-timestamp.o := -include include/generated/utsversion.h
 KASAN_SANITIZE_version-timestamp.o := n
+GCOV_PROFILE_version-timestamp.o := n

kernel/gen_kheaders.sh

···
 	xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
 
 # Create archive and try to normalize metadata for reproducibility.
-# For compatibility with older versions of tar, files are fed to tar
-# pre-sorted, as --sort=name might not be available.
-find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
-    tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
-    --owner=0 --group=0 --numeric-owner --no-recursion \
-    -I $XZ -cf $tarfile -C $cpio_dir/ -T - > /dev/null
+tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
+    --owner=0 --group=0 --sort=name --numeric-owner \
+    -I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null
 
 echo $headers_md5 > kernel/kheaders.md5
 echo "$this_file_md5" >> kernel/kheaders.md5

kernel/module/internal.h

···
 /* Maximum number of characters written by module_flags() */
 #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
 
+struct kernel_symbol {
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+	int value_offset;
+	int name_offset;
+	int namespace_offset;
+#else
+	unsigned long value;
+	const char *name;
+	const char *namespace;
+#endif
+};
+
 extern struct mutex module_mutex;
 extern struct list_head modules;
 

scripts/Makefile.build

···
 targets-for-builtin += $(obj)/built-in.a
 endif
 
-targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \
+targets-for-modules := $(foreach x, o mod, \
 				$(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
 
 ifdef need-modorder
···
 endif
 
 ifneq ($(KBUILD_EXTRA_WARN),)
-  cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
+  cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $(KDOCFLAGS) \
+        $(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \
+        $<
 endif
 
 # Compile C sources (.c)
···
 ifdef CONFIG_MODVERSIONS
 # When module versioning is enabled the following steps are executed:
 # o compile a <file>.o from <file>.c
-# o if <file>.o doesn't contain a __ksymtab version, i.e. does
+# o if <file>.o doesn't contain a __export_symbol_*, i.e. does
 #   not export symbols, it's done.
 # o otherwise, we calculate symbol versions using the good old
 #   genksyms on the preprocessed source and dump them into the .cmd file.
···
 #   be compiled and linked to the kernel and/or modules.
 
 gen_symversions =								\
-	if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then			\
+	if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then		\
 		$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
 			>> $(dot-target).cmd;					\
 	fi
···
 
 $(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
 
-ifdef CONFIG_TRIM_UNUSED_KSYMS
-cmd_gen_ksymdeps = \
-	$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
-endif
-
-cmd_check_local_export = $(srctree)/scripts/check-local-export $@
-
 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
 cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
 endif
 
 define rule_cc_o_c
 	$(call cmd_and_fixdep,cc_o_c)
-	$(call cmd,gen_ksymdeps)
-	$(call cmd,check_local_export)
 	$(call cmd,checksrc)
 	$(call cmd,checkdoc)
 	$(call cmd,gen_objtooldep)
···
 
 define rule_as_o_S
 	$(call cmd_and_fixdep,as_o_S)
-	$(call cmd,gen_ksymdeps)
-	$(call cmd,check_local_export)
 	$(call cmd,gen_objtooldep)
 	$(call cmd,gen_symversions_S)
 	$(call cmd,warn_shared_object)
···
 
 $(obj)/%.mod: FORCE
 	$(call if_changed,mod)
-
-# List module undefined symbols
-cmd_undefined_syms = $(NM) $< | sed -n 's/^  *U //p' > $@
-
-$(obj)/%.usyms: $(obj)/%.o FORCE
-	$(call if_changed,undefined_syms)
 
 quiet_cmd_cc_lst_c = MKLST   $@
       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
···
 cmd_gensymtypes_S =                                                         \
    { echo "\#include <linux/kernel.h>" ;                                    \
      echo "\#include <asm/asm-prototypes.h>" ;                              \
-    $(CPP) $(a_flags) $< |                                                  \
-     grep "\<___EXPORT_SYMBOL\>" |                                          \
-     sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
+     $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
 
 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@

scripts/Makefile.clang

···
 CLANG_FLAGS	+= -Werror=ignored-optimization-argument
 CLANG_FLAGS	+= -Werror=option-ignored
 CLANG_FLAGS	+= -Werror=unused-command-line-argument
-KBUILD_CFLAGS	+= $(CLANG_FLAGS)
-KBUILD_AFLAGS	+= $(CLANG_FLAGS)
+KBUILD_CPPFLAGS	+= $(CLANG_FLAGS)
 export CLANG_FLAGS

scripts/Makefile.clean

···
 
 # ==========================================================================
 
+# To make this rule robust against "Argument list too long" error,
+# remove $(obj)/ prefix, and restore it by a shell command.
 quiet_cmd_clean = CLEAN   $(obj)
-      cmd_clean = rm -rf $(__clean-files)
+      cmd_clean = printf '$(obj)/%s ' $(patsubst $(obj)/%,%,$(__clean-files)) | xargs rm -rf
 
 __clean: $(subdir-ymn)
 ifneq ($(strip $(__clean-files)),)

scripts/Makefile.compiler

···
 # Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
 
 as-option = $(call try-run,\
-	$(CC) -Werror $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
+	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
 
 # as-instr
 # Usage: aflags-y += $(call as-instr,instr,option1,option2)
 
 as-instr = $(call try-run,\
-	printf "%b\n" "$(1)" | $(CC) -Werror $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
+	printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
 
 # __cc-option
 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)

scripts/Makefile.lib

···
 $(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 	$(call if_changed_dep,dtb)
 
-$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
-	$(call if_changed_dep,dtc)
-
 $(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
 	$(call if_changed_dep,dtc)
 

scripts/Makefile.modfinal

···
 part-of-module = y
 
 quiet_cmd_cc_o_c = CC [M]  $@
-      cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
+      cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI) $(CFLAGS_GCOV), $(c_flags)) -c -o $@ $<
 
 %.mod.o: %.mod.c FORCE
 	$(call if_changed_dep,cc_o_c)

scripts/Makefile.modpost

···
 	$(if $(KBUILD_MODPOST_WARN),-w)							\
 	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS))					\
 	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)	\
+	$(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W)					\
 	-o $@
 
 modpost-deps := $(MODPOST)
···
 targets += .vmlinux.objs
 .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
 	$(call if_changed,vmlinux_objs)
+
+ifdef CONFIG_TRIM_UNUSED_KSYMS
+ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST)
+ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(srctree)/)$(ksym-wl)
+modpost-args += -t $(addprefix -u , $(ksym-wl))
+modpost-deps += $(ksym-wl)
+endif
 
 ifeq ($(wildcard vmlinux.o),)
 missing-input := vmlinux.o

scripts/Makefile.vmlinux

···
 
 ifdef CONFIG_MODULES
 KASAN_SANITIZE_.vmlinux.export.o := n
+GCOV_PROFILE_.vmlinux.export.o := n
 targets += .vmlinux.export.o
 vmlinux: .vmlinux.export.o
 endif

scripts/adjust_autoksyms.sh

···
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0-only
-
-# Script to update include/generated/autoksyms.h and dependency files
-#
-# Copyright:	(C) 2016  Linaro Limited
-# Created by:	Nicolas Pitre, January 2016
-#
-
-# Update the include/generated/autoksyms.h file.
-#
-# For each symbol being added or removed, the corresponding dependency
-# file's timestamp is updated to force a rebuild of the affected source
-# file. All arguments passed to this script are assumed to be a command
-# to be exec'd to trigger a rebuild of those files.
-
-set -e
-
-cur_ksyms_file="include/generated/autoksyms.h"
-new_ksyms_file="include/generated/autoksyms.h.tmpnew"
-
-info() {
-	if [ "$quiet" != "silent_" ]; then
-		printf "  %-7s %s\n" "$1" "$2"
-	fi
-}
-
-info "CHK" "$cur_ksyms_file"
-
-# Use "make V=1" to debug this script.
-case "$KBUILD_VERBOSE" in
-*1*)
-	set -x
-	;;
-esac
-
-# Generate a new symbol list file
-$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh --modorder "$new_ksyms_file"
-
-# Extract changes between old and new list and touch corresponding
-# dependency files.
-changed=$(
-count=0
-sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
-sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' |
-while read sympath; do
-	if [ -z "$sympath" ]; then continue; fi
-	depfile="include/ksym/${sympath}"
-	mkdir -p "$(dirname "$depfile")"
-	touch "$depfile"
-	# Filesystems with coarse time precision may create timestamps
-	# equal to the one from a file that was very recently built and that
-	# needs to be rebuild. Let's guard against that by making sure our
-	# dep files are always newer than the first file we created here.
-	while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
-		touch "$depfile"
-	done
-	echo $((count += 1))
-done | tail -1 )
-changed=${changed:-0}
-
-if [ $changed -gt 0 ]; then
-	# Replace the old list with tne new one
-	old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
-	new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
-	info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
-	info "UPD" "$cur_ksyms_file"
-	mv -f "$new_ksyms_file" "$cur_ksyms_file"
-	# Then trigger a rebuild of affected source files
-	exec $@
-else
-	rm -f "$new_ksyms_file"
-fi

scripts/basic/fixdep.c

···
 /* Ignore certain dependencies */
 static int is_ignored_file(const char *s, int len)
 {
-	return str_ends_with(s, len, "include/generated/autoconf.h") ||
-	       str_ends_with(s, len, "include/generated/autoksyms.h");
+	return str_ends_with(s, len, "include/generated/autoconf.h");
 }
 
 /* Do not parse these files */

scripts/check-local-export

···
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Copyright (C) 2022 Masahiro Yamada <[e-mail]>
-# Copyright (C) 2022 Owen Rafferty <[e-mail]>
-#
-# Exit with error if a local exported symbol is found.
-# EXPORT_SYMBOL should be used for global symbols.
-
-set -e
-pid=$$
-
-# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows
-# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by
-# '2>/dev/null'. However, it suppresses real error messages as well. Add a
-# hand-crafted error message here.
-#
-# TODO:
-# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of
-# binutils to 2.37, llvm to 13.0.0.
-# Then, the following line will be simpler:
-#   { ${NM} --quiet ${1} || kill 0; } |
-
-{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; kill $pid; } } |
-${AWK} -v "file=${1}" '
-BEGIN {
-	i = 0
-}
-
-# Skip the line if the number of fields is less than 3.
-#
-# case 1)
-#   For undefined symbols, the first field (value) is empty.
-#   The outout looks like this:
-#     "                 U _printk"
-#   It is unneeded to record undefined symbols.
-#
-# case 2)
-#   For Clang LTO, llvm-nm outputs a line with type t but empty name:
-#     "---------------- t"
-!length($3) {
-	next
-}
-
-# save (name, type) in the associative array
-{ symbol_types[$3]=$2 }
-
-# append the exported symbol to the array
-($3 ~ /^__ksymtab_/) {
-	export_symbols[i] = $3
-	sub(/^__ksymtab_/, "", export_symbols[i])
-	i++
-}
-
-END {
-	exit_code = 0
-	for (j = 0; j < i; ++j) {
-		name = export_symbols[j]
-		# nm(3) says "If lowercase, the symbol is usually local"
-		if (symbol_types[name] ~ /[a-z]/) {
-			printf "%s: error: local symbol %s was exported\n",
-				file, name | "cat 1>&2"
-			exit_code = 1
-		}
-	}
-
-	exit exit_code
-}'
-
-exit $?

scripts/gen_autoksyms.sh

···
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0-only
-
-# Create an autoksyms.h header file from the list of all module's needed symbols
-# as recorded in *.usyms files and the user-provided symbol whitelist.
-
-set -e
-
-# Use "make V=1" to debug this script.
-case "$KBUILD_VERBOSE" in
-*1*)
-	set -x
-	;;
-esac
-
-read_modorder=
-
-if [ "$1" = --modorder ]; then
-	shift
-	read_modorder=1
-fi
-
-output_file="$1"
-
-needed_symbols=
-
-# Special case for modversions (see modpost.c)
-if grep -q "^CONFIG_MODVERSIONS=y$" include/config/auto.conf; then
-	needed_symbols="$needed_symbols module_layout"
-fi
-
-ksym_wl=$(sed -n 's/^CONFIG_UNUSED_KSYMS_WHITELIST=\(.*\)$/\1/p' include/config/auto.conf)
-if [ -n "$ksym_wl" ]; then
-	[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
-	if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
-		echo "ERROR: '$ksym_wl' whitelist file not found" >&2
-		exit 1
-	fi
-fi
-
-# Generate a new ksym list file with symbols needed by the current
-# set of modules.
-cat > "$output_file" << EOT
-/*
- * Automatically generated file; DO NOT EDIT.
- */
-
-EOT
-
-{
-	[ -n "${read_modorder}" ] && sed 's/o$/usyms/' modules.order | xargs cat
-	echo "$needed_symbols"
-	[ -n "$ksym_wl" ] && cat "$ksym_wl"
-} | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
-# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
-# point addresses.
-sed -e 's/^\.//' |
-sort -u |
-# Ignore __this_module. It's not an exported symbol, and will be resolved
-# when the final .ko's are linked.
-grep -v '^__this_module$' |
-sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"

scripts/gen_ksymdeps.sh

···
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-
-set -e
-
-# List of exported symbols
-#
-# If the object has no symbol, $NM warns 'no symbols'.
-# Suppress the stderr.
-# TODO:
-#   Use -q instead of 2>/dev/null when we upgrade the minimum version of
-#   binutils to 2.37, llvm to 13.0.0.
-ksyms=$($NM $1 2>/dev/null | sed -n 's/.*__ksym_marker_\(.*\)/\1/p')
-
-if [ -z "$ksyms" ]; then
-	exit 0
-fi
-
-echo
-echo "ksymdeps_$1 := \\"
-
-for s in $ksyms
-do
-	printf '    $(wildcard include/ksym/%s) \\\n' "$s"
-done
-
-echo
-echo "$1: \$(ksymdeps_$1)"
-echo
-echo "\$(ksymdeps_$1):"

scripts/kallsyms.c

···
  *
  */
 
+#include <errno.h>
 #include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>
···
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
-#define _stringify_1(x)	#x
-#define _stringify(x)	_stringify_1(x)
-
 #define KSYM_NAME_LEN		512
-
-/*
- * A substantially bigger size than the current maximum.
- *
- * It cannot be defined as an expression because it gets stringified
- * for the fscanf() format string. Therefore, a _Static_assert() is
- * used instead to maintain the relationship with KSYM_NAME_LEN.
- */
-#define KSYM_NAME_LEN_BUFFER	2048
-_Static_assert(
-	KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
-	"Please keep KSYM_NAME_LEN_BUFFER in sync with KSYM_NAME_LEN"
-);
 
 struct sym_entry {
 	unsigned long long addr;
···
 	}
 }
 
-static struct sym_entry *read_symbol(FILE *in)
+static struct sym_entry *read_symbol(FILE *in, char **buf, size_t *buf_len)
 {
-	char name[KSYM_NAME_LEN_BUFFER+1], type;
+	char *name, type, *p;
 	unsigned long long addr;
-	unsigned int len;
+	size_t len;
+	ssize_t readlen;
 	struct sym_entry *sym;
-	int rc;
 
-	rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN_BUFFER) "s\n", &addr, &type, name);
-	if (rc != 3) {
-		if (rc != EOF && fgets(name, ARRAY_SIZE(name), in) == NULL)
-			fprintf(stderr, "Read error or end of file.\n");
+	readlen = getline(buf, buf_len, in);
+	if (readlen < 0) {
+		if (errno) {
+			perror("read_symbol");
+			exit(EXIT_FAILURE);
+		}
 		return NULL;
 	}
-	if (strlen(name) >= KSYM_NAME_LEN) {
+
+	if ((*buf)[readlen - 1] == '\n')
+		(*buf)[readlen - 1] = 0;
+
+	addr = strtoull(*buf, &p, 16);
+
+	if (*buf == p || *p++ != ' ' || !isascii((type = *p++)) || *p++ != ' ') {
+		fprintf(stderr, "line format error\n");
+		exit(EXIT_FAILURE);
+	}
+
+	name = p;
+	len = strlen(name);
+
+	if (len >= KSYM_NAME_LEN) {
 		fprintf(stderr, "Symbol %s too long for kallsyms (%zu >= %d).\n"
 				"Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
-			name, strlen(name), KSYM_NAME_LEN);
+			name, len, KSYM_NAME_LEN);
 		return NULL;
 	}
 
···
 
 	/* include the type field in the symbol name, so that it gets
 	 * compressed together */
-
-	len = strlen(name) + 1;
+	len++;
 
 	sym = malloc(sizeof(*sym) + len + 1);
 	if (!sym) {
···
 {
 	FILE *fp;
 	struct sym_entry *sym;
+	char *buf = NULL;
+	size_t buflen = 0;
 
 	fp = fopen(in, "r");
 	if (!fp) {
···
 	}
 
 	while (!feof(fp)) {
-		sym = read_symbol(fp);
+		sym = read_symbol(fp, &buf, &buflen);
 		if (!sym)
 			continue;
 
···
 		table[table_cnt++] = sym;
 	}
 
+	free(buf);
 	fclose(fp);
 }
 
···
 int main(int argc, char **argv)
 {
 	while (1) {
-		static struct option long_options[] = {
+		static const struct option long_options[] = {
 			{"all-symbols",     no_argument, &all_symbols,     1},
 			{"absolute-percpu", no_argument, &absolute_percpu, 1},
 			{"base-relative",   no_argument, &base_relative,   1},

scripts/kconfig/streamline_config.pl

···
 	$_ = convert_vars($_, %make_vars);
 
 	# collect objects after obj-$(CONFIG_FOO_BAR)
-	if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
+	if (/obj-\$[({](CONFIG_[^})]*)[)}]\s*[+:]?=\s*(.*)/) {
 	    $var = $1;
 	    $objs = $2;
 

scripts/kernel-doc

···
 
 =head1 SYNOPSIS
 
- kernel-doc [-h] [-v] [-Werror]
+ kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-description] [-Wcontents-before-sections]
    [ -man |
      -rst [-sphinx-version VERSION] [-enable-lineno] |
      -none
···
 
 my $verbose = 0;
 my $Werror = 0;
+my $Wreturn = 0;
+my $Wshort_desc = 0;
+my $Wcontents_before_sections = 0;
 my $output_mode = "rst";
 my $output_preformatted = 0;
 my $no_doc_sections = 0;
···
 	}
 }
 
+# reading this variable is for backwards compat just in case
+# someone was calling it with the variable from outside the
+# kernel's build system
 if (defined($ENV{'KDOC_WERROR'})) {
 	$Werror = "$ENV{'KDOC_WERROR'}";
 }
+# other environment variables are converted to command-line
+# arguments in cmd_checkdoc in the build system
 
 # Generated docbook code is inserted in a template at a point where
 # docbook v3.1 requires a non-zero sequence of RefEntry's; see:
···
 	$verbose = 1;
     } elsif ($cmd eq "Werror") {
 	$Werror = 1;
+    } elsif ($cmd eq "Wreturn") {
+	$Wreturn = 1;
+    } elsif ($cmd eq "Wshort-desc") {
+	$Wshort_desc = 1;
+    } elsif ($cmd eq "Wcontents-before-sections") {
+	$Wcontents_before_sections = 1;
+    } elsif ($cmd eq "Wall") {
+        $Wreturn = 1;
+        $Wshort_desc = 1;
+        $Wcontents_before_sections = 1;
     } elsif (($cmd eq "h") || ($cmd eq "help")) {
 		pod2usage(-exitval => 0, -verbose => 2);
     } elsif ($cmd eq 'no-doc-sections') {
···
     # This check emits a lot of warnings at the moment, because many
     # functions don't have a 'Return' doc section. So until the number
     # of warnings goes sufficiently down, the check is only performed in
-    # verbose mode.
+    # -Wreturn mode.
     # TODO: always perform the check.
-    if ($verbose && !$noret) {
+    if ($Wreturn && !$noret) {
 	    check_return_section($file, $declaration_name, $return_type);
     }
 
···
 	    $state = STATE_NORMAL;
 	}
 
-	if (($declaration_purpose eq "") && $verbose) {
+	if (($declaration_purpose eq "") && $Wshort_desc) {
 	    emit_warning("${file}:$.", "missing initial short description on line:\n$_");
 	}
 
···
 	}
 
 	if (($contents ne "") && ($contents ne "\n")) {
-	    if (!$in_doc_sect && $verbose) {
+	    if (!$in_doc_sect && $Wcontents_before_sections) {
 		emit_warning("${file}:$.", "contents before sections\n");
 	    }
 	    dump_section($file, $section, $contents);

scripts/mksysmap

···
 #  (do not forget a space before each pattern)
 
 # local symbols for ARM, MIPS, etc.
-/ \$/d
+/ \\$/d
 
 # local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
 / \.L/d
···
 # arm64 EFI stub namespace
 / __efistub_/d
 
+# arm64 local symbols in PIE namespace
+/ __pi_\\$/d
+/ __pi_\.L/d
+
 # arm64 local symbols in non-VHE KVM namespace
-/ __kvm_nvhe_\$/d
+/ __kvm_nvhe_\\$/d
 / __kvm_nvhe_\.L/d
 
 # arm64 lld
···
 
 # CFI type identifiers
 / __kcfi_typeid_/d
+/ __kvm_nvhe___kcfi_typeid_/d
+/ __pi___kcfi_typeid_/d
 
 # CRC from modversions
 / __crc_/d

scripts/mod/modpost.c

···
 
 static int sec_mismatch_count;
 static bool sec_mismatch_warn_only = true;
+/* Trim EXPORT_SYMBOLs that are unused by in-tree modules */
+static bool trim_unused_exports;
+
 /* ignore missing files */
 static bool ignore_missing_files;
 /* If set to 1, only warn (instead of error) about missing ns imports */
 static bool allow_missing_ns_imports;
 
 static bool error_occurred;
+
+static bool extra_warn;
 
 /*
  * Cut off the warnings when there are too many. This typically occurs when
···
 	unsigned int crc;
 	bool crc_valid;
 	bool weak;
+	bool is_func;
 	bool is_gpl_only;	/* exported by EXPORT_SYMBOL_GPL */
+	bool used;		/* there exists a user of this symbol */
 	char name[];
 };
 
···
 {
 	struct namespace_list *list;
 
+	/*
+	 * The default namespace is null string "", which is always implicitly
+	 * contained.
+	 */
+	if (!namespace[0])
+		return true;
+
 	list_for_each_entry(list, head, list) {
 		if (!strcmp(list->namespace, namespace))
 			return true;
···
 
 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
 
-static void sym_update_namespace(const char *symname, const char *namespace)
-{
-	struct symbol *s = find_symbol(symname);
-
-	/*
-	 * That symbol should have been created earlier and thus this is
-	 * actually an assertion.
-	 */
-	if (!s) {
-		error("Could not update namespace(%s) for symbol %s\n",
-		      namespace, symname);
-		return;
-	}
-
-	free(s->namespace);
-	s->namespace = namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
-}
-
 static struct symbol *sym_add_exported(const char *name, struct module *mod,
-				       bool gpl_only)
+				       bool gpl_only, const char *namespace)
 {
 	struct symbol *s = find_symbol(name);
 
···
 	s = alloc_symbol(name);
 	s->module = mod;
 	s->is_gpl_only = gpl_only;
+	s->namespace = NOFAIL(strdup(namespace));
 	list_add_tail(&s->list, &mod->exported_symbols);
 	hash_add_symbol(s);
 
···
 				fatal("%s has NOBITS .modinfo\n", filename);
 			info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
 			info->modinfo_len = sechdrs[i].sh_size;
+		} else if (!strcmp(secname, ".export_symbol")) {
+			info->export_symbol_secndx = i;
 		}
 
 		if (sechdrs[i].sh_type == SHT_SYMTAB) {
···
 				   ELF_ST_BIND(sym->st_info) == STB_WEAK);
 		break;
 	default:
-		/* All exported symbols */
-		if (strstarts(symname, "__ksymtab_")) {
-			const char *name, *secname;
-
-			name = symname + strlen("__ksymtab_");
-			secname = sec_name(info, get_secindex(info, sym));
-
-			if (strstarts(secname, "___ksymtab_gpl+"))
-				sym_add_exported(name, mod, true);
-			else if (strstarts(secname, "___ksymtab+"))
-				sym_add_exported(name, mod, false);
-		}
 		if (strcmp(symname, "init_module") == 0)
 			mod->has_init = true;
 		if (strcmp(symname, "cleanup_module") == 0)
···
 #define ALL_TEXT_SECTIONS  ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
 		TEXT_SECTIONS, OTHER_TEXT_SECTIONS
 
-/* init data sections */
-static const char *const init_data_sections[] =
-	{ ALL_INIT_DATA_SECTIONS, NULL };
-
-/* all init sections */
-static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
-
-/* all text sections */
-static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
-
-/* data section */
-static const char *const data_sections[] = { DATA_SECTIONS, NULL };
-
-static const char *const head_sections[] = { ".head.text*", NULL };
-static const char *const linker_symbols[] =
-	{ "__init_begin", "_sinittext", "_einittext", NULL };
-static const char *const optim_symbols[] = { "*.constprop.*", NULL };
-
 enum mismatch {
 	TEXT_TO_ANY_INIT,
 	DATA_TO_ANY_INIT,
-	TEXT_TO_ANY_EXIT,
-	DATA_TO_ANY_EXIT,
+	TEXTDATA_TO_ANY_EXIT,
 	XXXINIT_TO_SOME_INIT,
 	XXXEXIT_TO_SOME_EXIT,
 	ANY_INIT_TO_ANY_EXIT,
 	ANY_EXIT_TO_ANY_INIT,
-	EXPORT_TO_INIT_EXIT,
 	EXTABLE_TO_NON_TEXT,
 };
 
···
  * targeting sections in this array (white-list).  Can be empty.
  *
  * @mismatch: Type of mismatch.
- *
- * @handler: Specific handler to call when a match is found.  If NULL,
- * default_mismatch_handler() will be called.
- *
  */
 struct sectioncheck {
 	const char *fromsec[20];
 	const char *bad_tosec[20];
 	const char *good_tosec[20];
 	enum mismatch mismatch;
-	void (*handler)(const char *modname, struct elf_info *elf,
-			const struct sectioncheck* const mismatch,
-			Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
-
 };
-
-static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
-				     const struct sectioncheck* const mismatch,
-				     Elf_Rela *r, Elf_Sym *sym,
-				     const char *fromsec);
 
 static const struct sectioncheck sectioncheck[] = {
 /* Do not reference init/exit code/data from
···
 },
 {
 	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
+	.bad_tosec = { ALL_XXXINIT_SECTIONS, INIT_SECTIONS, NULL },
 	.mismatch = DATA_TO_ANY_INIT,
 },
 {
-	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { INIT_SECTIONS, NULL },
-	.mismatch = DATA_TO_ANY_INIT,
-},
-{
-	.fromsec = { TEXT_SECTIONS, NULL },
+	.fromsec = { TEXT_SECTIONS, DATA_SECTIONS, NULL },
 	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
-	.mismatch = TEXT_TO_ANY_EXIT,
-},
-{
-	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
-	.mismatch = DATA_TO_ANY_EXIT,
+	.mismatch = TEXTDATA_TO_ANY_EXIT,
 },
 /* Do not reference init code/data from meminit code/data */
 {
···
 	.bad_tosec = { INIT_SECTIONS, NULL },
 	.mismatch = ANY_INIT_TO_ANY_EXIT,
 },
-/* Do not export init/exit functions or data */
-{
-	.fromsec = { "___ksymtab*", NULL },
-	.bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
-	.mismatch = EXPORT_TO_INIT_EXIT,
-},
 {
 	.fromsec = { "__ex_table", NULL },
 	/* If you're adding any new black-listed sections in here, consider
···
 	.bad_tosec = { ".altinstr_replacement", NULL },
 	.good_tosec = {ALL_TEXT_SECTIONS , NULL},
 	.mismatch = EXTABLE_TO_NON_TEXT,
-	.handler = extable_mismatch_handler,
 }
 };
 
···
  *   fromsec = text section
  *   refsymname = *.constprop.*
  *
- * Pattern 6:
- *   Hide section mismatch warnings for ELF local symbols.  The goal
- *   is to eliminate false positive modpost warnings caused by
- *   compiler-generated ELF local symbol names such as ".LANCHOR1".
- *   Autogenerated symbol names bypass modpost's "Pattern 2"
- *   whitelisting, which relies on pattern-matching against symbol
- *   names to work.  (One situation where gcc can autogenerate ELF
- *   local symbols is when "-fsection-anchors" is used.)
  **/
-static int secref_whitelist(const struct sectioncheck *mismatch,
-			    const char *fromsec, const char *fromsym,
+static int secref_whitelist(const char *fromsec, const char *fromsym,
 			    const char *tosec, const char *tosym)
 {
 	/* Check for pattern 1 */
-	if (match(tosec, init_data_sections) &&
-	    match(fromsec, data_sections) &&
+	if (match(tosec, PATTERNS(ALL_INIT_DATA_SECTIONS)) &&
+	    match(fromsec, PATTERNS(DATA_SECTIONS)) &&
 	    strstarts(fromsym, "__param"))
 		return 0;
 
 	/* Check for pattern 1a */
 	if (strcmp(tosec, ".init.text") == 0 &&
-	    match(fromsec, data_sections) &&
+	    match(fromsec, PATTERNS(DATA_SECTIONS)) &&
 	    strstarts(fromsym, "__param_ops_"))
 		return 0;
 
···
 		return 0;
 
 	/* Check for pattern 3 */
-	if (match(fromsec, head_sections) &&
-	    match(tosec, init_sections))
+	if (strstarts(fromsec, ".head.text") &&
+	    match(tosec, PATTERNS(ALL_INIT_SECTIONS)))
 		return 0;
 
 	/* Check for pattern 4 */
-	if (match(tosym, linker_symbols))
+	if (match(tosym, PATTERNS("__init_begin", "_sinittext", "_einittext")))
 		return 0;
 
 	/* Check for pattern 5 */
-	if (match(fromsec, text_sections) &&
-	    match(tosec, init_sections) &&
-	    match(fromsym, optim_symbols))
-		return 0;
-
-	/* Check for pattern 6 */
-	if (strstarts(fromsym, ".L"))
+	if (match(fromsec, PATTERNS(ALL_TEXT_SECTIONS)) &&
+	    match(tosec, PATTERNS(ALL_INIT_SECTIONS)) &&
+	    match(fromsym, PATTERNS("*.constprop.*")))
 		return 0;
 
 	return 1;
···
 	return !is_mapping_symbol(name);
 }
 
-/**
- * Find symbol based on relocation record info.
- * In some cases the symbol supplied is a valid symbol so
- * return refsym. If st_name != 0 we assume this is a valid symbol.
- * In other cases the symbol needs to be looked up in the symbol table
- * based on section and address.
- *  **/
-static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
-				Elf_Sym *relsym)
+/* Look up the nearest symbol based on the section and the address */
+static Elf_Sym *find_nearest_sym(struct elf_info *elf, Elf_Addr addr,
+				 unsigned int secndx, bool allow_negative,
+				 Elf_Addr min_distance)
 {
 	Elf_Sym *sym;
 	Elf_Sym *near = NULL;
-	Elf64_Sword distance = 20;
-	Elf64_Sword d;
-	unsigned int relsym_secindex;
+	Elf_Addr sym_addr, distance;
+	bool is_arm = (elf->hdr->e_machine == EM_ARM);
 
-	if (relsym->st_name != 0)
-		return relsym;
-
-	relsym_secindex = get_secindex(elf, relsym);
 	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
-		if (get_secindex(elf, sym) != relsym_secindex)
-			continue;
-		if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
+		if (get_secindex(elf, sym) != secndx)
 			continue;
 		if (!is_valid_name(elf, sym))
 			continue;
-		if (sym->st_value == addr)
-			return sym;
-		/* Find a symbol nearby - addr are maybe negative */
-		d = sym->st_value - addr;
-		if (d < 0)
-			d = addr - sym->st_value;
-		if (d < distance) {
-			distance = d;
+
+		sym_addr = sym->st_value;
+
+		/*
+		 * For ARM Thumb instruction, the bit 0 of st_value is set
+		 * if the symbol is STT_FUNC type. Mask it to get the address.
+		 */
+		if (is_arm && ELF_ST_TYPE(sym->st_info) == STT_FUNC)
+			 sym_addr &= ~1;
+
+		if (addr >= sym_addr)
+			distance = addr - sym_addr;
+		else if (allow_negative)
+			distance = sym_addr - addr;
+		else
+			continue;
+
+		if (distance <= min_distance) {
+			min_distance = distance;
 			near = sym;
 		}
-	}
-	/* We need a close match */
-	if (distance < 20)
-		return near;
-	else
-		return NULL;
-}
 
-/*
- * Find symbols before or equal addr and after addr - in the section sec.
- * If we find two symbols with equal offset prefer one with a valid name.
- * The ELF format may have a better way to detect what type of symbol
- * it is, but this works for now.
- **/
-static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
-				 const char *sec)
-{
-	Elf_Sym *sym;
-	Elf_Sym *near = NULL;
-	Elf_Addr distance = ~0;
-
-	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
-		const char *symsec;
-
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		symsec = sec_name(elf, get_secindex(elf, sym));
-		if (strcmp(symsec, sec) != 0)
-			continue;
-		if (!is_valid_name(elf, sym))
-			continue;
-		if (sym->st_value <= addr && addr - sym->st_value <= distance) {
-			distance = addr - sym->st_value;
-			near = sym;
-		}
+		if (min_distance == 0)
+			break;
 	}
 	return near;
 }
 
-static int is_function(Elf_Sym *sym)
+static Elf_Sym *find_fromsym(struct elf_info *elf, Elf_Addr addr,
+			     unsigned int secndx)
 {
-	if (sym)
-		return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
-	else
-		return -1;
+	return find_nearest_sym(elf, addr, secndx, false, ~0);
 }
 
-static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
+static Elf_Sym *find_tosym(struct elf_info *elf, Elf_Addr addr, Elf_Sym *sym)
 {
-	switch (is_func) {
-	case 0:	*name = "variable"; *name_p = ""; break;
-	case 1:	*name = "function"; *name_p = "()"; break;
-	default: *name = "(unknown reference)"; *name_p = ""; break;
-	}
+	/* If the supplied symbol has a valid name, return it */
+	if (is_valid_name(elf, sym))
+		return sym;
+
+	/*
+	 * Strive to find a better symbol name, but the resulting name may not
+	 * match the symbol referenced in the original code.
+	 */
+	return find_nearest_sym(elf, addr, get_secindex(elf, sym), true, 20);
 }
 
-/*
- * Print a warning about a section mismatch.
- * Try to find symbols near it so user can find it.
- * Check whitelist before warning - it may be a false positive.
- */
-static void report_sec_mismatch(const char *modname,
-				const struct sectioncheck *mismatch,
-				const char *fromsec,
-				const char *fromsym,
-				const char *tosec, const char *tosym)
+static bool is_executable_section(struct elf_info *elf, unsigned int secndx)
 {
-	sec_mismatch_count++;
+	if (secndx >= elf->num_sections)
+		return false;
 
-	switch (mismatch->mismatch) {
-	case TEXT_TO_ANY_INIT:
-	case DATA_TO_ANY_INIT:
-	case TEXT_TO_ANY_EXIT:
-	case DATA_TO_ANY_EXIT:
-	case XXXINIT_TO_SOME_INIT:
-	case XXXEXIT_TO_SOME_EXIT:
-	case ANY_INIT_TO_ANY_EXIT:
-	case ANY_EXIT_TO_ANY_INIT:
-		warn("%s: section mismatch in reference: %s (section: %s) -> %s (section: %s)\n",
-		     modname, fromsym, fromsec, tosym, tosec);
-		break;
-	case EXPORT_TO_INIT_EXIT:
-		warn("%s: EXPORT_SYMBOL used for init/exit symbol: %s (section: %s)\n",
-		     modname, tosym, tosec);
-		break;
-	case EXTABLE_TO_NON_TEXT:
-		fatal("There's a special handler for this mismatch type, we should never get here.\n");
-		break;
-	}
+	return (elf->sechdrs[secndx].sh_flags & SHF_EXECINSTR) != 0;
 }
 
 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
 				     const struct sectioncheck* const mismatch,
-				     Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
+				     Elf_Sym *tsym,
+				     unsigned int fsecndx, const char *fromsec, Elf_Addr faddr,
+				     const char *tosec, Elf_Addr taddr)
 {
-	const char *tosec;
-	Elf_Sym *to;
 	Elf_Sym *from;
 	const char *tosym;
 	const char *fromsym;
 
-	from = find_elf_symbol2(elf, r->r_offset, fromsec);
+	from = find_fromsym(elf, faddr, fsecndx);
 	fromsym = sym_name(elf, from);
 
-	tosec = sec_name(elf, get_secindex(elf, sym));
-	to = find_elf_symbol(elf, r->r_addend, sym);
-	tosym = sym_name(elf, to);
+	tsym = find_tosym(elf, taddr, tsym);
+	tosym = sym_name(elf, tsym);
 
 	/* check whitelist - we may ignore it */
-	if (secref_whitelist(mismatch,
-			     fromsec, fromsym, tosec, tosym)) {
-		report_sec_mismatch(modname, mismatch,
-				    fromsec, fromsym, tosec, tosym);
-	}
-}
-
-static int is_executable_section(struct elf_info* elf, unsigned int section_index)
-{
-	if (section_index > elf->num_sections)
-		fatal("section_index is outside elf->num_sections!\n");
-
-	return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
-}
-
-/*
- * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
- * to know the sizeof(struct exception_table_entry) for the target architecture.
- */
-static unsigned int extable_entry_size = 0;
-static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
-{
-	/*
-	 * If we're currently checking the second relocation within __ex_table,
-	 * that relocation offset tells us the offsetof(struct
-	 * exception_table_entry, fixup) which is equal to sizeof(struct
-	 * exception_table_entry) divided by two.  We use that to our advantage
-	 * since there's no portable way to get that size as every architecture
-	 * seems to go with different sized types.  Not pretty but better than
-	 * hard-coding the size for every architecture..
-	 */
-	if (!extable_entry_size)
-		extable_entry_size = r->r_offset * 2;
-}
-
-static inline bool is_extable_fault_address(Elf_Rela *r)
-{
-	/*
-	 * extable_entry_size is only discovered after we've handled the
-	 * _second_ relocation in __ex_table, so only abort when we're not
-	 * handling the first reloc and extable_entry_size is zero.
-	 */
-	if (r->r_offset && extable_entry_size == 0)
-		fatal("extable_entry size hasn't been discovered!\n");
-
-	return ((r->r_offset == 0) ||
-		(r->r_offset % extable_entry_size == 0));
-}
-
-#define is_second_extable_reloc(Start, Cur, Sec)			\
-	(((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
-
-static void report_extable_warnings(const char* modname, struct elf_info* elf,
-				    const struct sectioncheck* const mismatch,
-				    Elf_Rela* r, Elf_Sym* sym,
-				    const char* fromsec, const char* tosec)
-{
-	Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
-	const char* fromsym_name = sym_name(elf, fromsym);
-	Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
-	const char* tosym_name = sym_name(elf, tosym);
-	const char* from_pretty_name;
-	const char* from_pretty_name_p;
-	const char* to_pretty_name;
-	const char* to_pretty_name_p;
-
-	get_pretty_name(is_function(fromsym),
-			&from_pretty_name, &from_pretty_name_p);
-	get_pretty_name(is_function(tosym),
-			&to_pretty_name, &to_pretty_name_p);
-
-	warn("%s(%s+0x%lx): Section mismatch in reference from the %s %s%s to the %s %s:%s%s\n",
-	     modname, fromsec, (long)r->r_offset, from_pretty_name,
-	     fromsym_name, from_pretty_name_p,
-	     to_pretty_name, tosec, tosym_name, to_pretty_name_p);
-
-	if (!match(tosec, mismatch->bad_tosec) &&
-	    is_executable_section(elf, get_secindex(elf, sym)))
-		fprintf(stderr,
-			"The relocation at %s+0x%lx references\n"
-			"section \"%s\" which is not in the list of\n"
-			"authorized sections.  If you're adding a new section\n"
-			"and/or if this reference is valid, add \"%s\" to the\n"
-			"list of authorized sections to jump to on fault.\n"
-			"This can be achieved by adding \"%s\" to \n"
-			"OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
-			fromsec, (long)r->r_offset, tosec, tosec, tosec);
-}
-
-static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
-				     const struct sectioncheck* const mismatch,
-				     Elf_Rela* r, Elf_Sym* sym,
-				     const char *fromsec)
-{
-	const char* tosec = sec_name(elf, get_secindex(elf, sym));
+	if (!secref_whitelist(fromsec, fromsym, tosec, tosym))
+		return;
 
 	sec_mismatch_count++;
 
-	report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
+	warn("%s: section mismatch in reference: %s+0x%x (section: %s) -> %s (section: %s)\n",
+	     modname, fromsym, (unsigned int)(faddr - from->st_value), fromsec, tosym, tosec);
 
-	if (match(tosec, mismatch->bad_tosec))
-		fatal("The relocation at %s+0x%lx references\n"
-		      "section \"%s\" which is black-listed.\n"
-		      "Something is seriously wrong and should be fixed.\n"
-		      "You might get more information about where this is\n"
-		      "coming from by using scripts/check_extable.sh %s\n",
-		      fromsec, (long)r->r_offset, tosec, modname);
-	else if (!is_executable_section(elf, get_secindex(elf, sym))) {
-		if (is_extable_fault_address(r))
+	if (mismatch->mismatch == EXTABLE_TO_NON_TEXT) {
+		if (match(tosec, mismatch->bad_tosec))
 			fatal("The relocation at %s+0x%lx references\n"
-			      "section \"%s\" which is not executable, IOW\n"
-			      "it is not possible for the kernel to fault\n"
-			      "at that address.  Something is seriously wrong\n"
-			      "and should be fixed.\n",
-			      fromsec, (long)r->r_offset, tosec);
+			      "section \"%s\" which is black-listed.\n"
+			      "Something is seriously wrong and should be fixed.\n"
+			      "You might get more information about where this is\n"
+			      "coming from by using scripts/check_extable.sh %s\n",
+			      fromsec, (long)faddr, tosec, modname);
+		else if (is_executable_section(elf, get_secindex(elf, tsym)))
+			warn("The relocation at %s+0x%lx references\n"
+			     "section \"%s\" which is not in the list of\n"
+			     "authorized sections.  If you're adding a new section\n"
+			     "and/or if this reference is valid, add \"%s\" to the\n"
+			     "list of authorized sections to jump to on fault.\n"
+			     "This can be achieved by adding \"%s\" to\n"
+			     "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
+			     fromsec, (long)faddr, tosec, tosec, tosec);
 		else
-			fatal("The relocation at %s+0x%lx references\n"
-			      "section \"%s\" which is not executable, IOW\n"
-			      "the kernel will fault if it ever tries to\n"
-			      "jump to it.  Something is seriously wrong\n"
-			      "and should be fixed.\n",
-			      fromsec, (long)r->r_offset, tosec);
+			error("%s+0x%lx references non-executable section '%s'\n",
+			      fromsec, (long)faddr, tosec);
 	}
 }
 
-static void check_section_mismatch(const char *modname, struct elf_info *elf,
-				   Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
+static void check_export_symbol(struct module *mod, struct elf_info *elf,
+				Elf_Addr faddr, const char *secname,
+				Elf_Sym *sym)
+{
+	static const char *prefix = "__export_symbol_";
+	const char *label_name, *name, *data;
+	Elf_Sym *label;
+	struct symbol *s;
+	bool is_gpl;
+
+	label = find_fromsym(elf, faddr, elf->export_symbol_secndx);
+	label_name = sym_name(elf, label);
+
+	if (!strstarts(label_name, prefix)) {
+		error("%s: .export_symbol section contains strange symbol '%s'\n",
+		      mod->name, label_name);
+		return;
+	}
+
+	if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
+	    ELF_ST_BIND(sym->st_info) != STB_WEAK) {
+		error("%s: local symbol '%s' was exported\n", mod->name,
+		      label_name + strlen(prefix));
+		return;
+	}
+
+	name = sym_name(elf, sym);
+	if (strcmp(label_name + strlen(prefix), name)) {
+		error("%s: .export_symbol section references '%s', but it does not seem to be an export symbol\n",
+		      mod->name, name);
+		return;
+	}
+
+	data = sym_get_data(elf, label);	/* license */
+	if (!strcmp(data, "GPL")) {
+		is_gpl = true;
+	} else if (!strcmp(data, "")) {
+		is_gpl = false;
+	} else {
+		error("%s: unknown license '%s' was specified for '%s'\n",
+		      mod->name, data, name);
+		return;
+	}
+
+	data += strlen(data) + 1;	/* namespace */
+	s = sym_add_exported(name, mod, is_gpl, data);
+
+	/*
+	 * We need to be aware whether we are exporting a function or
+	 * a data on some architectures.
+	 */
+	s->is_func = (ELF_ST_TYPE(sym->st_info) == STT_FUNC);
+
+	if (match(secname, PATTERNS(INIT_SECTIONS)))
+		warn("%s: %s: EXPORT_SYMBOL used for init symbol. Remove __init or EXPORT_SYMBOL.\n",
+		     mod->name, name);
+	else if (match(secname, PATTERNS(EXIT_SECTIONS)))
+		warn("%s: %s: EXPORT_SYMBOL used for exit symbol. Remove __exit or EXPORT_SYMBOL.\n",
+		     mod->name, name);
+}
+
+static void check_section_mismatch(struct module *mod, struct elf_info *elf,
+				   Elf_Sym *sym,
+				   unsigned int fsecndx, const char *fromsec,
+				   Elf_Addr faddr, Elf_Addr taddr)
 {
 	const char *tosec = sec_name(elf, get_secindex(elf, sym));
-	const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
+	const struct sectioncheck *mismatch;
 
-	if (mismatch) {
-		if (mismatch->handler)
-			mismatch->handler(modname, elf,  mismatch,
-					  r, sym, fromsec);
-		else
-			default_mismatch_handler(modname, elf, mismatch,
-						 r, sym, fromsec);
+	if (elf->export_symbol_secndx == fsecndx) {
+		check_export_symbol(mod, elf, faddr, tosec, sym);
+		return;
 	}
+
+	mismatch = section_mismatch(fromsec, tosec);
+	if (!mismatch)
+		return;
+
+	default_mismatch_handler(mod->name, elf, mismatch, sym,
+				 fsecndx, fromsec, faddr,
+				 tosec, taddr);
 }
 
-static unsigned int *reloc_location(struct elf_info *elf,
-				    Elf_Shdr *sechdr, Elf_Rela *r)
-{
-	return sym_get_data_by_offset(elf, sechdr->sh_info, r->r_offset);
-}
-
-static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static int addend_386_rel(uint32_t *location, Elf_Rela *r)
 {
 	unsigned int r_typ = ELF_R_TYPE(r->r_info);
-	unsigned int *location = reloc_location(elf, sechdr, r);
 
 	switch (r_typ) {
 	case R_386_32:
···
 	case R_386_PC32:
 		r->r_addend = TO_NATIVE(*location) + 4;
 		break;
+	default:
+		r->r_addend = (Elf_Addr)(-1);
 	}
 	return 0;
 }
···
 #ifndef	R_ARM_THM_JUMP24
 #define	R_ARM_THM_JUMP24	30
 #endif
+
+#ifndef R_ARM_MOVW_ABS_NC
+#define R_ARM_MOVW_ABS_NC	43
+#endif
+
+#ifndef R_ARM_MOVT_ABS
+#define R_ARM_MOVT_ABS		44
+#endif
+
+#ifndef R_ARM_THM_MOVW_ABS_NC
+#define R_ARM_THM_MOVW_ABS_NC	47
+#endif
+
+#ifndef R_ARM_THM_MOVT_ABS
+#define R_ARM_THM_MOVT_ABS	48
+#endif
+
 #ifndef	R_ARM_THM_JUMP19
 #define	R_ARM_THM_JUMP19	51
 #endif
 
-static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static int32_t sign_extend32(int32_t value, int index)
+{
+	uint8_t shift = 31 - index;
+
+	return (int32_t)(value << shift) >> shift;
+}
+
+static int addend_arm_rel(void *loc, Elf_Sym *sym, Elf_Rela *r)
 {
 	unsigned int r_typ = ELF_R_TYPE(r->r_info);
+	uint32_t inst, upper, lower, sign, j1, j2;
+	int32_t offset;
 
 	switch (r_typ) {
 	case R_ARM_ABS32:
-		/* From ARM ABI: (S + A) | T */
-		r->r_addend = (int)(long)
-			      (elf->symtab_start + ELF_R_SYM(r->r_info));
+	case R_ARM_REL32:
+		inst = TO_NATIVE(*(uint32_t *)loc);
+		r->r_addend = inst + sym->st_value;
+		break;
+	case R_ARM_MOVW_ABS_NC:
+	case R_ARM_MOVT_ABS:
+		inst = TO_NATIVE(*(uint32_t *)loc);
+		offset = sign_extend32(((inst & 0xf0000) >> 4) | (inst & 0xfff),
+				       15);
+		r->r_addend = offset + sym->st_value;
 		break;
 	case R_ARM_PC24:
 	case R_ARM_CALL:
 	case R_ARM_JUMP24:
+		inst = TO_NATIVE(*(uint32_t *)loc);
+		offset = sign_extend32((inst & 0x00ffffff) << 2, 25);
+		r->r_addend = offset + sym->st_value + 8;
+		break;
+	case R_ARM_THM_MOVW_ABS_NC:
+	case R_ARM_THM_MOVT_ABS:
+		upper = TO_NATIVE(*(uint16_t *)loc);
+		lower = TO_NATIVE(*((uint16_t *)loc + 1));
+		offset = sign_extend32(((upper & 0x000f) << 12) |
+				       ((upper & 0x0400) << 1) |
+				       ((lower & 0x7000) >> 4) |
+				       (lower & 0x00ff),
+				       15);
+		r->r_addend = offset + sym->st_value;
+		break;
+	case R_ARM_THM_JUMP19:
+		/*
+		 * Encoding T3:
+		 * S     = upper[10]
+		 * imm6  = upper[5:0]
+		 * J1    = lower[13]
+		 * J2    = lower[11]
+		 * imm11 = lower[10:0]
+		 * imm32 = SignExtend(S:J2:J1:imm6:imm11:'0')
+		 */
+		upper = TO_NATIVE(*(uint16_t *)loc);
+		lower = TO_NATIVE(*((uint16_t *)loc + 1));
+
+		sign = (upper >> 10) & 1;
+		j1 = (lower >> 13) & 1;
+		j2 = (lower >> 11) & 1;
+		offset = sign_extend32((sign << 20) | (j2 << 19) | (j1 << 18) |
+				       ((upper & 0x03f) << 12) |
+				       ((lower & 0x07ff) << 1),
+				       20);
+		r->r_addend = offset + sym->st_value + 4;
+		break;
 	case R_ARM_THM_CALL:
 	case R_ARM_THM_JUMP24:
-	case R_ARM_THM_JUMP19:
-		/* From ARM ABI: ((S + A) | T) - P */
-		r->r_addend = (int)(long)(elf->hdr +
-			      sechdr->sh_offset +
-			      (r->r_offset - sechdr->sh_addr));
+		/*
+		 * Encoding T4:
+		 * S     = upper[10]
+		 * imm10 = upper[9:0]
+		 * J1    = lower[13]
+		 * J2    = lower[11]
+		 * imm11 = lower[10:0]
+		 * I1    = NOT(J1 XOR S)
+		 * I2    = NOT(J2 XOR S)
+		 * imm32 = SignExtend(S:I1:I2:imm10:imm11:'0')
+		 */
+		upper = TO_NATIVE(*(uint16_t *)loc);
+		lower = TO_NATIVE(*((uint16_t *)loc + 1));
+
+		sign = (upper >> 10) & 1;
+		j1 = (lower >> 13) & 1;
+		j2 = (lower >> 11) & 1;
+		offset = sign_extend32((sign << 24) |
+				       ((~(j1 ^ sign) & 1) << 23) |
+				       ((~(j2 ^ sign) & 1) << 22) |
+				       ((upper & 0x03ff) << 12) |
+				       ((lower & 0x07ff) << 1),
+				       24);
+		r->r_addend = offset + sym->st_value + 4;
 		break;
 	default:
-		return 1;
+		r->r_addend = (Elf_Addr)(-1);
 	}
 	return 0;
 }
 
-static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static int addend_mips_rel(uint32_t *location, Elf_Rela *r)
 {
 	unsigned int r_typ = ELF_R_TYPE(r->r_info);
-	unsigned int *location = reloc_location(elf, sechdr, r);
-	unsigned int inst;
+	uint32_t inst;
 
-	if (r_typ == R_MIPS_HI16)
-		return 1;	/* skip this */
 	inst = TO_NATIVE(*location);
 	switch (r_typ) {
 	case R_MIPS_LO16:
···
 	case R_MIPS_32:
 		r->r_addend = inst;
 		break;
+	default:
+		r->r_addend = (Elf_Addr)(-1);
 	}
 	return 0;
 }
···
 #define R_LARCH_SUB32		55
 #endif
 
-static void section_rela(const char *modname, struct elf_info *elf,
+static void section_rela(struct module *mod, struct elf_info *elf,
 			 Elf_Shdr *sechdr)
 {
-	Elf_Sym  *sym;
 	Elf_Rela *rela;
 	Elf_Rela r;
 	unsigned int r_sym;
-	const char *fromsec;
-
+	unsigned int fsecndx = sechdr->sh_info;
+	const char *fromsec = sec_name(elf, fsecndx);
 	Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
 	Elf_Rela *stop  = (void *)start + sechdr->sh_size;
 
-	fromsec = sec_name(elf, sechdr->sh_info);
 	/* if from section (name) is know good then skip it */
 	if (match(fromsec, section_white_list))
 		return;
···
 				continue;
 			break;
 		}
-		sym = elf->symtab_start + r_sym;
-		/* Skip special sections */
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		if (is_second_extable_reloc(start, rela, fromsec))
-			find_extable_entry_size(fromsec, &r);
-		check_section_mismatch(modname, elf, &r, sym, fromsec);
+
+		check_section_mismatch(mod, elf, elf->symtab_start + r_sym,
+				       fsecndx, fromsec, r.r_offset, r.r_addend);
 	}
 }
 
-static void section_rel(const char *modname, struct elf_info *elf,
+static void section_rel(struct module *mod, struct elf_info *elf,
 			Elf_Shdr *sechdr)
 {
-	Elf_Sym *sym;
 	Elf_Rel *rel;
 	Elf_Rela r;
 	unsigned int r_sym;
-	const char *fromsec;
-
+	unsigned int fsecndx = sechdr->sh_info;
+	const char *fromsec = sec_name(elf, fsecndx);
 	Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
 	Elf_Rel *stop  = (void *)start + sechdr->sh_size;
 
-	fromsec = sec_name(elf, sechdr->sh_info);
 	/* if from section (name) is know good then skip it */
 	if (match(fromsec, section_white_list))
 		return;
 
 	for (rel = start; rel < stop; rel++) {
+		Elf_Sym *tsym;
+		void *loc;
+
 		r.r_offset = TO_NATIVE(rel->r_offset);
 #if KERNEL_ELFCLASS == ELFCLASS64
 		if (elf->hdr->e_machine == EM_MIPS) {
···
 		r_sym = ELF_R_SYM(r.r_info);
 #endif
 		r.r_addend = 0;
+
+		loc = sym_get_data_by_offset(elf, fsecndx, r.r_offset);
+		tsym = elf->symtab_start + r_sym;
+
 		switch (elf->hdr->e_machine) {
 		case EM_386:
-			if (addend_386_rel(elf, sechdr, &r))
-				continue;
+			addend_386_rel(loc, &r);
 			break;
 		case EM_ARM:
-			if (addend_arm_rel(elf, sechdr, &r))
-				continue;
+			addend_arm_rel(loc, tsym, &r);
 			break;
 		case EM_MIPS:
-			if (addend_mips_rel(elf, sechdr, &r))
-				continue;
+			addend_mips_rel(loc, &r);
 			break;
+		default:
+			fatal("Please add code to calculate addend for this architecture\n");
 		}
-		sym = elf->symtab_start + r_sym;
-		/* Skip special sections */
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		if (is_second_extable_reloc(start, rel, fromsec))
-			find_extable_entry_size(fromsec, &r);
-		check_section_mismatch(modname, elf, &r, sym, fromsec);
+
+		check_section_mismatch(mod, elf, tsym,
+				       fsecndx, fromsec, r.r_offset, r.r_addend);
 	}
 }
 
···
  * to find all references to a section that reference a section that will
  * be discarded and warns about it.
  **/
-static void check_sec_ref(const char *modname, struct elf_info *elf)
+static void check_sec_ref(struct module *mod, struct elf_info *elf)
 {
 	int i;
 	Elf_Shdr *sechdrs = elf->sechdrs;
 
 	/* Walk through all sections */
 	for (i = 0; i < elf->num_sections; i++) {
-		check_section(modname, elf, &elf->sechdrs[i]);
+		check_section(mod->name, elf, &elf->sechdrs[i]);
 		/* We want to process only relocation sections and not .init */
 		if (sechdrs[i].sh_type == SHT_RELA)
-			section_rela(modname, elf, &elf->sechdrs[i]);
+			section_rela(mod, elf, &elf->sechdrs[i]);
 		else if (sechdrs[i].sh_type == SHT_REL)
-			section_rel(modname, elf, &elf->sechdrs[i]);
+			section_rel(mod, elf, &elf->sechdrs[i]);
 	}
 }
 
···
 		}
 	}
 
+	if (extra_warn && !get_modinfo(&info, "description"))
+		warn("missing MODULE_DESCRIPTION() in %s\n", modname);
 	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
 		symname = remove_dot(info.strtab + sym->st_name);
 
···
 		handle_moddevtable(mod, &info, sym, symname);
 	}
 
-	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
-		symname = remove_dot(info.strtab + sym->st_name);
-
-		/* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
-		if (strstarts(symname, "__kstrtabns_"))
-			sym_update_namespace(symname + strlen("__kstrtabns_"),
-					     sym_get_data(&info, sym));
-	}
-
-	check_sec_ref(modname, &info);
+	check_sec_ref(mod, &info);
 
 	if (!mod->is_vmlinux) {
 		version = get_modinfo(&info, "version");
···
 			continue;
 		}
 
+		exp->used = true;
 		s->module = exp->module;
 		s->crc_valid = exp->crc_valid;
 		s->crc = exp->crc;
···
 		else
 			basename = mod->name;
 
-		if (exp->namespace &&
-		    !contains_namespace(&mod->imported_namespaces, exp->namespace)) {
+		if (!contains_namespace(&mod->imported_namespaces, exp->namespace)) {
 			modpost_log(allow_missing_ns_imports ? LOG_WARN : LOG_ERROR,
 				    "module %s uses symbol %s from namespace %s, but does not import it.\n",
 				    basename, exp->name, exp->namespace);
···
 			error("GPL-incompatible module %s.ko uses GPL-only symbol '%s'\n",
 			      basename, exp->name);
 	}
+}
+
+static void handle_white_list_exports(const char *white_list)
+{
+	char *buf, *p, *name;
+
+	buf = read_text_file(white_list);
+	p = buf;
+
+	while ((name = strsep(&p, "\n"))) {
+		struct symbol *sym = find_symbol(name);
+
+		if (sym)
+			sym->used = true;
+	}
+
+	free(buf);
 }
 
 static void check_modname_len(struct module *mod)
···
 {
 	struct symbol *sym;
 
+	/* generate struct for exported symbols */
+	buf_printf(buf, "\n");
+	list_for_each_entry(sym, &mod->exported_symbols, list) {
+		if (trim_unused_exports && !sym->used)
+			continue;
+
+		buf_printf(buf, "KSYMTAB_%s(%s, \"%s\", \"%s\");\n",
+			   sym->is_func ? "FUNC" : "DATA", sym->name,
+			   sym->is_gpl_only ? "_gpl" : "", sym->namespace);
+	}
+
 	if (!modversions)
 		return;
 
 	/* record CRCs for exported symbols */
 	buf_printf(buf, "\n");
 	list_for_each_entry(sym, &mod->exported_symbols, list) {
+		if (trim_unused_exports && !sym->used)
+			continue;
+
 		if (!sym->crc_valid)
 			warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
 			     "Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
···
 	char fname[PATH_MAX];
 	int ret;
 
-	check_modname_len(mod);
-	check_exports(mod);
-
 	add_header(&buf, mod);
 	add_exported_symbols(&buf, mod);
 	add_versions(&buf, mod);
···
 			mod = new_module(modname, strlen(modname));
 			mod->from_dump = true;
 		}
-		s = sym_add_exported(symname, mod, gpl_only);
+		s = sym_add_exported(symname, mod, gpl_only, namespace);
 		sym_set_crc(s, crc);
-		sym_update_namespace(symname, namespace);
 	}
 	free(buf);
 	return;
···
 		if (mod->from_dump)
 			continue;
 		list_for_each_entry(sym, &mod->exported_symbols, list) {
+			if (trim_unused_exports && !sym->used)
+				continue;
+
 			buf_printf(&buf, "0x%08x\t%s\t%s\tEXPORT_SYMBOL%s\t%s\n",
 				   sym->crc, sym->name, mod->name,
 				   sym->is_gpl_only ? "_GPL" : "",
-				   sym->namespace ?: "");
+				   sym->namespace);
 		}
 	}
 	write_buf(&buf, fname);
···
 {
 	struct module *mod;
 	char *missing_namespace_deps = NULL;
+	char *unused_exports_white_list = NULL;
 	char *dump_write = NULL, *files_source = NULL;
 	int opt;
 	LIST_HEAD(dump_lists);
 	struct dump_list *dl, *dl2;
 
-	while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
+	while ((opt = getopt(argc, argv, "ei:mnT:to:au:WwENd:")) != -1) {
 		switch (opt) {
 		case 'e':
 			external_module = true;
···
 			break;
 		case 'T':
 			files_source = optarg;
+			break;
+		case 't':
+			trim_unused_exports = true;
+			break;
+		case 'u':
+			unused_exports_white_list = optarg;
+			break;
+		case 'W':
+			extra_warn = true;
 			break;
 		case 'w':
 			warn_unresolved = true;
···
 
 	if (files_source)
 		read_symbols_from_files(files_source);
+
+	list_for_each_entry(mod, &modules, list) {
+		if (mod->from_dump || mod->is_vmlinux)
+			continue;
+
+		check_modname_len(mod);
+		check_exports(mod);
+	}
+
+	if (unused_exports_white_list)
+		handle_white_list_exports(unused_exports_white_list);
 
 	list_for_each_entry(mod, &modules, list) {
 		if (mod->from_dump)

scripts/mod/modpost.h

···
 	Elf_Shdr     *sechdrs;
 	Elf_Sym      *symtab_start;
 	Elf_Sym      *symtab_stop;
+	unsigned int export_symbol_secndx;	/* .export_symbol section */
 	char         *strtab;
 	char	     *modinfo;
 	unsigned int modinfo_len;
···
 	Elf32_Word   *symtab_shndx_start;
 	Elf32_Word   *symtab_shndx_stop;
 };
-
-static inline int is_shndx_special(unsigned int i)
-{
-	return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
-}
 
 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
 static inline unsigned int get_secindex(const struct elf_info *info,

scripts/package/builddeb

···
 		${MAKE} -f ${srctree}/Makefile INSTALL_DTBS_PATH="${pdir}/usr/lib/linux-image-${KERNELRELEASE}" dtbs_install
 	fi
 
-	if is_enabled CONFIG_MODULES; then
-		${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install
-		rm -f "${pdir}/lib/modules/${KERNELRELEASE}/build"
-		rm -f "${pdir}/lib/modules/${KERNELRELEASE}/source"
-		if [ "${SRCARCH}" = um ] ; then
-			mkdir -p "${pdir}/usr/lib/uml/modules"
-			mv "${pdir}/lib/modules/${KERNELRELEASE}" "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}"
-		fi
-	fi
+	${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install
+	rm -f "${pdir}/lib/modules/${KERNELRELEASE}/build"
+	rm -f "${pdir}/lib/modules/${KERNELRELEASE}/source"
 
 	# Install the kernel
 	if [ "${ARCH}" = um ] ; then
+		mkdir -p "${pdir}/usr/lib/uml/modules"
+		mv "${pdir}/lib/modules/${KERNELRELEASE}" "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}"
 		mkdir -p "${pdir}/usr/bin" "${pdir}/usr/share/doc/${pname}"
 		cp System.map "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}/System.map"
 		cp ${KCONFIG_CONFIG} "${pdir}/usr/share/doc/${pname}/config"

scripts/remove-stale-files

···
 rm -f scripts/bin2c
 
 rm -f .scmversion
+
+rm -rf include/ksym
+
+find . -name '*.usyms' | xargs rm -f

scripts/tags.sh

···
 	tree=${srctree}/
 fi
 
+# gtags(1) refuses to index any file outside of its current working dir.
+# If gtags indexing is requested and the build output directory is not
+# the kernel source tree, index all files in absolute-path form.
+if [[ "$1" == "gtags" && -n "${tree}" ]]; then
+	tree=$(realpath "$tree")/
+fi
+
 # Detect if ALLSOURCE_ARCHS is set. If not, we assume SRCARCH
 if [ "${ALLSOURCE_ARCHS}" = "" ]; then
 	ALLSOURCE_ARCHS=${SRCARCH}
···
 
 dogtags()
 {
-	all_target_sources | gtags -i -f -
+	all_target_sources | gtags -i -C "${tree:-.}" -f - "$PWD"
 }
 
 # Basic regular expressions with an optional /kind-spec/ for ctags and

usr/Makefile

···
 	$(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
 	$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
 	$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
+	$(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \
 	$(ramfs-input)
 
 # We rebuild initramfs_data.cpio if:

usr/gen_initramfs.sh

···
 	-g <gid>       Group ID to map to group ID 0 (root).
 		       <gid> is only meaningful if <cpio_source> is a
 		       directory.  "squash" forces all files to gid 0.
+	-d <date>      Use date for all file mtime values
 	<cpio_source>  File list or directory for cpio archive.
 		       If <cpio_source> is a .cpio file it will be used
 		       as direct input to initramfs.
···
 root_uid=0
 root_gid=0
 dep_list=
+timestamp=
 cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
 output="/dev/stdout"
 
···
 			[ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)
 			shift
 			;;
+		"-d")	# date for file mtimes
+			timestamp="$(date -d"$1" +%s || :)"
+			if test -n "$timestamp"; then
+				timestamp="-t $timestamp"
+			fi
+			shift
+			;;
 		"-h")
 			usage
 			exit 0
···
 
 # If output_file is set we will generate cpio archive
 # we are careful to delete tmp files
-timestamp=
-if test -n "$KBUILD_BUILD_TIMESTAMP"; then
-	timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
-	if test -n "$timestamp"; then
-		timestamp="-t $timestamp"
-	fi
-fi
 usr/gen_init_cpio $timestamp $cpio_list > $output