linux-kernel - [RFC-PATCH] x86: really use __builtin_memcmp on x86

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Date:	Sun, 09 Nov 2008 22:12:23 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC-PATCH] x86: really use __builtin_memcmp on x86_32

Impact: prevent generic code from overriding __builtin_memcmp

lib/string.c was using a generic implementation of memcmp
because __HAVE_ARCH_MEMCMP was not defined and it was then doing
#undef memcmp and defining a generic version.

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 arch/x86/include/asm/string_32.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/string_32.h b/arch/x86/include/asm/string_32.h
index c86f452..b671baf 100644
--- a/arch/x86/include/asm/string_32.h
+++ b/arch/x86/include/asm/string_32.h
@@ -195,6 +195,7 @@ static inline void *__memcpy3d(void *to, const void *from, size_t len)
 #define __HAVE_ARCH_MEMMOVE
 void *memmove(void *dest, const void *src, size_t n);
 
+#define __HAVE_ARCH_MEMCMP
 #define memcmp __builtin_memcmp
 
 #define __HAVE_ARCH_MEMCHR
-- 
1.6.0.3.866.gc189b



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