From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 8 Aug 2008 14:02:19 +0000 (+0100)
Subject: x86: adjust placement of pause insn in _raw_spin_lock()
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14159^2
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a288bd4a0fe5e47f58bfb4e3c6300f0d6d341e15;p=xen.git

x86: adjust placement of pause insn in _raw_spin_lock()

React to lock becoming available as quickly as possible.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
---

diff --git a/xen/include/asm-x86/spinlock.h b/xen/include/asm-x86/spinlock.h
index 59be73656b..550edcb4e5 100644
--- a/xen/include/asm-x86/spinlock.h
+++ b/xen/include/asm-x86/spinlock.h
@@ -23,8 +23,8 @@ static inline void _raw_spin_lock(spinlock_t *lock)
         "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"