[PATCH v2 08/10] x86/entry: Only allocate space for SYSENTER_stack if needed

[Andy Lutomirski]

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 <l...@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