linux-kernel - [PATCH 14/15] x86/ticketlocks: use cmpxchg

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Message-Id: <7c78985287f9006156f394bfce69437023773461.1314054734.git.jeremy.fitzhardinge@citrix.com>
Date:	Mon, 22 Aug 2011 16:15:10 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 14/15] x86/ticketlocks: use cmpxchg_flag for trylock

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/include/asm/spinlock.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index 05fd59e..e208c8f 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -102,7 +102,7 @@ static __always_inline int __ticket_spin_trylock(arch_spinlock_t *lock)
 	new.head_tail = old.head_tail + (1 << TICKET_SHIFT);
 
 	/* cmpxchg is a full barrier, so nothing can move before it */
-	return cmpxchg(&lock->head_tail, old.head_tail, new.head_tail) == old.head_tail;
+	return cmpxchg_flag(&lock->head_tail, old.head_tail, new.head_tail);
 }
 
 static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
-- 
1.7.6

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