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| author |   Andy Lutomirski <luto@kernel.org> | 2016-03-09 19:00:31 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-03-10 09:48:14 +0100 |
| commit | 6dcc94149d605908a7c0c4cf2085340637aac86d (patch) | |
| tree | 0d94f10fe9247fefb19237f2f0a116761ff48ff1 /arch | |
| parent | x86/entry: Vastly simplify SYSENTER TF (single-step) handling (diff) | |
| download | linux-dev-6dcc94149d605908a7c0c4cf2085340637aac86d.tar.xz linux-dev-6dcc94149d605908a7c0c4cf2085340637aac86d.zip | |
x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed
The SYSENTER stack is only used on 32-bit kernels. Remove it on 64-bit kernels.
( We may end up using it down the road on 64-bit kernels. If so,
we'll re-enable it for CONFIG_IA32_EMULATION. )
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
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: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/9dbd18429f9ff61a76b6eda97a9ea20510b9f6ba.1457578375.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index ecb410310e70..7cd01b71b5bd 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -297,10 +297,12 @@ struct tss_struct { */ unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; +#ifdef CONFIG_X86_32 /* * Space for the temporary SYSENTER stack: */ unsigned long SYSENTER_stack[64]; +#endif } ____cacheline_aligned; |