linux-kernel - [PATCH 4/5] x86/entry: Only allocate space for SYSENTER

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Date:	Thu, 23 Jul 2015 08:31:42 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	X86 ML <x86@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Steven Rostedt <rostedt@...dmis.org>, Willy Tarreau <w@....eu>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 4/5] x86/entry: Only allocate space for SYSENTER_stack if needed

The SYSENTER stack is only used in configurations that support 32-bit
code and, hence, SYSENTER.  Remove it in 64-bit non-compat configurations.

Signed-off-by: Andy Lutomirski <luto@...nel.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 befc1341f110..786f50e4bd90 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -298,10 +298,12 @@ struct tss_struct {
 	 */
 	unsigned long		io_bitmap[IO_BITMAP_LONGS + 1];
 
+#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
 	/*
 	 * Space for the temporary SYSENTER stack:
 	 */
 	unsigned long		SYSENTER_stack[64];
+#endif
 
 } ____cacheline_aligned;
 
-- 
2.4.3

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