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[Xen-devel] [PATCH] x86: adjust placement of pause insn in _raw_spin_loc
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] x86: adjust placement of pause insn in _raw_spin_lock() |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Fri, 08 Aug 2008 13:49:05 +0100 |
| Delivery-date: | Fri, 08 Aug 2008 05:48:37 -0700 |
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Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: 2008-08-06/xen/include/asm-x86/spinlock.h
===================================================================
--- 2008-08-06.orig/xen/include/asm-x86/spinlock.h 2007-09-10
09:59:37.000000000 +0200
+++ 2008-08-06/xen/include/asm-x86/spinlock.h 2008-08-07 12:36:13.000000000
+0200
@@ -23,8 +23,8 @@ static inline void _raw_spin_lock(spinlo
"1: lock; decb %0 \n"
" js 2f \n"
".section .text.lock,\"ax\"\n"
- "2: cmpb $0,%0 \n"
- " rep; nop \n"
+ "2: rep; nop \n"
+ " cmpb $0,%0 \n"
" jle 2b \n"
" jmp 1b \n"
".previous"
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