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x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed

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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>
This commit is contained in:
Andy Lutomirski 2016-03-09 19:00:31 -08:00 committed by Ingo Molnar
parent f2b375756c
commit 6dcc94149d
1 changed files with 2 additions and 0 deletions
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2
arch/x86/include/asm/processor.h
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@ -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;