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Message-Id: <1444157670-19951-1-git-send-email-bobby.prani@gmail.com> Date: Tue, 6 Oct 2015 14:54:29 -0400 From: Pranith Kumar <bobby.prani@...il.com> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)) Subject: [PATCH] x86: cmpxchg_double: Add missing memory clobber We are reading from memory locations pointed to by p1 and p2 in the asm block. Add a memory clobber flag to make gcc aware of this. Signed-off-by: Pranith Kumar <bobby.prani@...il.com> --- arch/x86/include/asm/cmpxchg.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h index 4a2e5bc..3e83949 100644 --- a/arch/x86/include/asm/cmpxchg.h +++ b/arch/x86/include/asm/cmpxchg.h @@ -214,7 +214,8 @@ extern void __add_wrong_size(void) : "=a" (__ret), "+d" (__old2), \ "+m" (*(p1)), "+m" (*(p2)) \ : "i" (2 * sizeof(long)), "a" (__old1), \ - "b" (__new1), "c" (__new2)); \ + "b" (__new1), "c" (__new2) \ + : "memory"); \ __ret; \ }) -- 2.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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