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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
x86: Use generic TIF bits
No point in defining generic items and the upcoming RSEQ optimizations are
only available with this _and_ the generic entry infrastructure, which is
already used by x86. So no further action required here.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+31
-44
+1
arch/x86/Kconfig
+1
arch/x86/Kconfig
···
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select HAVE_EFFICIENT_UNALIGNED_ACCESS
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select HAVE_EISA if X86_32
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select HAVE_EXIT_THREAD
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+
select HAVE_GENERIC_TIF_BITS
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select HAVE_GUP_FAST
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select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE
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select HAVE_FTRACE_GRAPH_FUNC if HAVE_FUNCTION_GRAPH_TRACER
+30
-44
arch/x86/include/asm/thread_info.h
+30
-44
arch/x86/include/asm/thread_info.h
···
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#endif
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/*
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-
* thread information flags
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* - these are process state flags that various assembly files
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* may need to access
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+
* Tell the generic TIF infrastructure which bits x86 supports
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*/
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_NEED_RESCHED_LAZY 4 /* Lazy rescheduling needed */
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#define TIF_SINGLESTEP 5 /* reenable singlestep on user return*/
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#define TIF_SSBD 6 /* Speculative store bypass disable */
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#define TIF_SPEC_IB 9 /* Indirect branch speculation mitigation */
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#define TIF_SPEC_L1D_FLUSH 10 /* Flush L1D on mm switches (processes) */
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#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
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#define TIF_UPROBE 12 /* breakpointed or singlestepping */
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#define TIF_PATCH_PENDING 13 /* pending live patching update */
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#define TIF_NEED_FPU_LOAD 14 /* load FPU on return to userspace */
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#define TIF_NOCPUID 15 /* CPUID is not accessible in userland */
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#define TIF_NOTSC 16 /* TSC is not accessible in userland */
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#define TIF_NOTIFY_SIGNAL 17 /* signal notifications exist */
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#define TIF_MEMDIE 20 /* is terminating due to OOM killer */
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#define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */
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+
#define HAVE_TIF_NEED_RESCHED_LAZY
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#define HAVE_TIF_POLLING_NRFLAG
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#define HAVE_TIF_SINGLESTEP
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+
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#include <asm-generic/thread_info_tif.h>
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+
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/* Architecture specific TIF space starts at 16 */
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#define TIF_SSBD 16 /* Speculative store bypass disable */
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#define TIF_SPEC_IB 17 /* Indirect branch speculation mitigation */
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#define TIF_SPEC_L1D_FLUSH 18 /* Flush L1D on mm switches (processes) */
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#define TIF_NEED_FPU_LOAD 19 /* load FPU on return to userspace */
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#define TIF_NOCPUID 20 /* CPUID is not accessible in userland */
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#define TIF_NOTSC 21 /* TSC is not accessible in userland */
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#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
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#define TIF_SPEC_FORCE_UPDATE 23 /* Force speculation MSR update in context switch */
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#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
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#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */
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#define TIF_SINGLESTEP 25 /* reenable singlestep on user return*/
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#define TIF_BLOCKSTEP 26 /* set when we want DEBUGCTLMSR_BTF */
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#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
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#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */
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#define TIF_ADDR32 28 /* 32-bit address space on 64 bits */
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#define _TIF_SSBD (1 << TIF_SSBD)
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#define _TIF_SPEC_IB (1 << TIF_SPEC_IB)
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#define _TIF_SPEC_L1D_FLUSH (1 << TIF_SPEC_L1D_FLUSH)
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#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
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#define _TIF_UPROBE (1 << TIF_UPROBE)
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#define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING)
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#define _TIF_NEED_FPU_LOAD (1 << TIF_NEED_FPU_LOAD)
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#define _TIF_NOCPUID (1 << TIF_NOCPUID)
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#define _TIF_NOTSC (1 << TIF_NOTSC)
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
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#define _TIF_SPEC_FORCE_UPDATE (1 << TIF_SPEC_FORCE_UPDATE)
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#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
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#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
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#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
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#define _TIF_ADDR32 (1 << TIF_ADDR32)
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#define _TIF_SSBD BIT(TIF_SSBD)
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#define _TIF_SPEC_IB BIT(TIF_SPEC_IB)
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#define _TIF_SPEC_L1D_FLUSH BIT(TIF_SPEC_L1D_FLUSH)
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#define _TIF_NEED_FPU_LOAD BIT(TIF_NEED_FPU_LOAD)
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#define _TIF_NOCPUID BIT(TIF_NOCPUID)
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#define _TIF_NOTSC BIT(TIF_NOTSC)
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#define _TIF_IO_BITMAP BIT(TIF_IO_BITMAP)
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#define _TIF_SPEC_FORCE_UPDATE BIT(TIF_SPEC_FORCE_UPDATE)
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#define _TIF_FORCED_TF BIT(TIF_FORCED_TF)
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#define _TIF_BLOCKSTEP BIT(TIF_BLOCKSTEP)
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#define _TIF_SINGLESTEP BIT(TIF_SINGLESTEP)
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#define _TIF_LAZY_MMU_UPDATES BIT(TIF_LAZY_MMU_UPDATES)
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#define _TIF_ADDR32 BIT(TIF_ADDR32)
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/* flags to check in __switch_to() */
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#define _TIF_WORK_CTXSW_BASE \