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    Subject[PATCH 08/10] x86/entry: Only allocate space for SYSENTER_stack if needed
    Date
    The SYSENTER stack is only used on 32-bit kernels.  Remove it in
    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>
    ---
    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 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;

    --
    2.5.0
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