linux-kernel - [tip:x86/spinlocks] x86, ticketlock: Use xadd helper

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Message-ID: <tip-599c3e7724ab4520c6f11857eb953271d365f842@git.kernel.org>
Date:	Fri, 22 Jul 2011 19:58:35 GMT
From:	tip-bot for Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...ux.intel.com,
	jeremy.fitzhardinge@...rix.com
Subject: [tip:x86/spinlocks] x86, ticketlock: Use xadd helper

Commit-ID:  599c3e7724ab4520c6f11857eb953271d365f842
Gitweb:     http://git.kernel.org/tip/599c3e7724ab4520c6f11857eb953271d365f842
Author:     Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
AuthorDate: Thu, 23 Jun 2011 18:19:20 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 22 Jul 2011 11:19:05 -0700

x86, ticketlock: Use xadd helper

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Link: http://lkml.kernel.org/r/aa7c94ecfbee05a6b8e455271ba0bb467bf33b2f.1308878118.git.jeremy.fitzhardinge@citrix.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/include/asm/spinlock.h |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index e07dc41..da196f1 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -71,14 +71,7 @@ static __always_inline struct __raw_tickets __ticket_spin_claim(struct arch_spin
 {
 	register struct __raw_tickets tickets = { .tail = 1 };
 
-	if (sizeof(lock->tickets.head) == sizeof(u8))
-		asm volatile (LOCK_PREFIX "xaddw %w0, %1\n"
-			      : "+r" (tickets), "+m" (lock->tickets)
-			      : : "memory", "cc");
-	else
-		asm volatile (LOCK_PREFIX "xaddl %0, %1\n"
-			     : "+r" (tickets), "+m" (lock->tickets)
-			     : : "memory", "cc");
+	xadd(&lock->tickets, tickets);
 
 	return tickets;
 }
--
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