Commit-ID: 6dcc94149d605908a7c0c4cf2085340637aac86d Gitweb: http://git.kernel.org/tip/6dcc94149d605908a7c0c4cf2085340637aac86d Author: Andy Lutomirski <[email protected]> AuthorDate: Wed, 9 Mar 2016 19:00:31 -0800 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 10 Mar 2016 09:48:14 +0100
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 <[email protected]> Cc: Andrew Cooper <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/9dbd18429f9ff61a76b6eda97a9ea20510b9f6ba.1457578375.git.l...@kernel.org Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/include/asm/processor.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index ecb4103..7cd01b7 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;
