[PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed

From	Andy Lutomirski <luto@kernel.org>
Newsgroups	linux.kernel
Subject	[PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed
Date	2016-03-10 04:10 +0100
Message-ID	<raZ98-HP-19@gated-at.bofh.it> (permalink)
References	<raZ97-HP-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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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[PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed Andy Lutomirski <luto@kernel.org> - 2016-03-10 04:10 +0100
  [tip:x86/asm] x86/entry: Only allocate space for  tss_struct::SYSENTER_stack if needed tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-03-10 12:10 +0100

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