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[PATCH] [11/11] i386: Use patchable lock prefix in set_64bit

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From: Andi Kleen <ak@...>
To: <patches@...>, <linux-kernel@...>
Subject: [PATCH] [11/11] i386: Use patchable lock prefix in set_64bit
Date: Friday, July 20, 2007 - 11:32 am

Previously lock was unconditionally used, but shouldn't be needed on
UP systems.

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/include/asm-i386/cmpxchg.h
===================================================================
--- linux.orig/include/asm-i386/cmpxchg.h
+++ linux/include/asm-i386/cmpxchg.h
@@ -34,7 +34,7 @@ static inline void __set_64bit (unsigned
 		"\n1:\t"
 		"movl (%0), %%eax\n\t"
 		"movl 4(%0), %%edx\n\t"
-		"lock cmpxchg8b (%0)\n\t"
+		LOCK_PREFIX "cmpxchg8b (%0)\n\t"
 		"jnz 1b"
 		: /* no outputs */
 		:	"D"(ptr),
-
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Messages in current thread:
[PATCH] [0/11] Some more x86 patches for review, Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [11/11] i386: Use patchable lock prefix in set_64bit, Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [10/11] i386: Handle P6s without performance counter..., Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [9/11] x86: Replace NSC/Cyrix specific chipset acces..., Andi Kleen, (Fri Jul 20, 11:32 am)
Re: [PATCH] [9/11] x86: Replace NSC/Cyrix specific chipset a..., Alexey Dobriyan, (Sat Jul 21, 8:00 am)
Re: [PATCH] [9/11] x86: Replace NSC/Cyrix specific chipset a..., Juergen Beisert, (Sun Jul 22, 6:45 am)
Re: [PATCH] [9/11] x86: Replace NSC/Cyrix specific chipset a..., Andi Kleen, (Sat Jul 21, 8:04 am)
[PATCH] [8/11] x86_64: x86_64 - Use non locked version for l..., Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [7/11] i386: Do not include other cpus' interrupt 0 ..., Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [6/11] i386: Tune AMD Fam10h/11h like K8, Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [5/11] x86: Unify alternative nop handling between i..., Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [4/11] x86_64: Set K8 CPUID flag for K8/Fam10h/Fam11h, Andi Kleen, (Fri Jul 20, 11:32 am)
[PATCH] [3/11] x86: Stop MCEs and NMIs during code patching, Andi Kleen, (Fri Jul 20, 11:32 am)
Re: [PATCH] [3/11] x86: Stop MCEs and NMIs during code patch..., Jeremy Fitzhardinge, (Fri Jul 20, 11:45 am)
Re: [PATCH] [3/11] x86: Stop MCEs and NMIs during code patch..., Mathieu Desnoyers, (Fri Jul 20, 12:03 pm)
[PATCH] [2/11] x86: Fix alternatives and kprobes to remap wr..., Andi Kleen, (Fri Jul 20, 11:32 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Mathieu Desnoyers, (Mon Jul 23, 10:46 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Andi Kleen, (Mon Jul 23, 11:01 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Mathieu Desnoyers, (Mon Jul 23, 11:25 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Mathieu Desnoyers, (Fri Jul 20, 11:59 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Rusty Russell, (Tue Jul 24, 2:06 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Mathieu Desnoyers, (Tue Jul 24, 9:57 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Jeremy Fitzhardinge, (Tue Jul 24, 11:17 am)
Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to rema..., Mathieu Desnoyers, (Tue Jul 24, 11:20 am)
[PATCH] [1/11] i386: Reserve the right performance counter ..., Andi Kleen, (Fri Jul 20, 11:32 am)