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| author | Andy Lutomirski <luto@kernel.org> | 2016-03-09 13:24:33 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-03-10 10:53:26 +0100 |
| commit | 9999c8c01f34c918a57d6e5ba2f5d8b79aa04801 (patch) | |
| tree | fc47bd645a0dd3d20f8a1fd78812d9e6f09b5ad7 /arch/x86/include/asm/thread_info.h | |
| parent | a798f091113ef4999277dbe0483d37d04fa35b2e (diff) | |
| download | linux-0-day-9999c8c01f34c918a57d6e5ba2f5d8b79aa04801.tar.gz linux-0-day-9999c8c01f34c918a57d6e5ba2f5d8b79aa04801.tar.xz | |
x86/entry: Call enter_from_user_mode() with IRQs off
Now that slow-path syscalls always enter C before enabling
interrupts, it's straightforward to call enter_from_user_mode() before
enabling interrupts rather than doing it as part of entry tracing.
With this change, we should finally be able to retire exception_enter().
This will also enable optimizations based on knowing that we never
change context tracking state with interrupts on.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/bc376ecf87921a495e874ff98139b1ca2f5c5dd7.1457558566.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/thread_info.h')
| -rw-r--r-- | arch/x86/include/asm/thread_info.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index f2e2302c406fb..82866697fcf18 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -134,7 +134,10 @@ struct thread_info { #define _TIF_ADDR32 (1 << TIF_ADDR32) #define _TIF_X32 (1 << TIF_X32) -/* work to do in syscall_trace_enter() */ +/* + * work to do in syscall_trace_enter(). Also includes TIF_NOHZ for + * enter_from_user_mode() + */ #define _TIF_WORK_SYSCALL_ENTRY \ (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ |