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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	the arch/x86 maintainers <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Nick Piggin <npiggin@kernel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Subject: [PATCH 08/15] x86/ticketlock: use xadd helper
Date: Mon, 22 Aug 2011 16:15:04 -0700	[thread overview]
Message-ID: <82e514016e787feec5568851cafd3234a7b9d307.1314054734.git.jeremy.fitzhardinge@citrix.com> (raw)
In-Reply-To: <cover.1314045780.git.jeremy.fitzhardinge@citrix.com>
In-Reply-To: <cover.1314054734.git.jeremy.fitzhardinge@citrix.com>

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

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.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 4857dee..05fd59e 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;
 }
-- 
1.7.6


  parent reply	other threads:[~2011-08-22 23:15 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-22 23:14 [PATCH 00/12] x86: Ticket lock cleanup Jeremy Fitzhardinge
     [not found] ` <cover.1314054734.git.jeremy.fitzhardinge@citrix.com>
2011-08-22 23:14   ` [PATCH 01/15] x86/ticketlock: clean up types and accessors Jeremy Fitzhardinge
2011-08-22 23:14   ` [PATCH 02/15] x86/ticketlock: convert spin loop to C Jeremy Fitzhardinge
2011-08-22 23:14   ` [PATCH 03/15] x86/ticketlock: Use C for __ticket_spin_unlock Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 04/15] x86/ticketlock: make large and small ticket versions of spin_lock the same Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 05/15] x86/ticketlock: make __ticket_spin_lock common Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 06/15] x86/ticketlock: make __ticket_spin_trylock common Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 07/15] x86: add xadd helper macro Jeremy Fitzhardinge
2011-08-22 23:29     ` H. Peter Anvin
2011-08-22 23:43       ` Jeremy Fitzhardinge
2011-08-23  4:41         ` H. Peter Anvin
2011-08-23 10:59     ` Peter Zijlstra
2011-08-23 16:34       ` Jeremy Fitzhardinge
2011-08-22 23:15   ` Jeremy Fitzhardinge [this message]
2011-08-22 23:15   ` [PATCH 09/15] x86/cmpxchg: linux/alternative.h has LOCK_PREFIX Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 10/15] x86/cmpxchg: move 32-bit __cmpxchg_wrong_size to match 64 bit Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 11/15] x86/cmpxchg: move 64-bit set64_bit() to match 32-bit Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 12/15] x86/cmpxchg: unify cmpxchg into cmpxchg.h Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 13/15] x86: add cmpxchg_flag() variant Jeremy Fitzhardinge
2011-08-23 19:01     ` Christoph Lameter
2011-08-23 19:22       ` H. Peter Anvin
2011-08-23 19:52         ` Christoph Lameter
2011-08-23 21:03           ` H. Peter Anvin
2011-08-23 19:53       ` Jeremy Fitzhardinge
2011-08-23 20:45         ` H. Peter Anvin
2011-08-23 22:15           ` Jeremy Fitzhardinge
2011-08-23 22:43             ` H. Peter Anvin
2011-08-24 13:54               ` Christoph Lameter
2011-08-24 13:53             ` Christoph Lameter
2011-08-24 16:33               ` Jeremy Fitzhardinge
2011-08-24 19:27                 ` Christoph Lameter
2011-08-24 20:15                   ` Jeremy Fitzhardinge
2011-08-24 20:31                   ` H. Peter Anvin
2011-08-24 20:38                     ` Jeremy Fitzhardinge
2011-08-24 23:04                       ` H. Peter Anvin
2011-08-24 23:11                         ` Linus Torvalds
2011-08-24 23:19                           ` Jeremy Fitzhardinge
2011-08-25 14:07                             ` Christoph Lameter
2011-08-22 23:15   ` [PATCH 14/15] x86/ticketlocks: use cmpxchg_flag for trylock Jeremy Fitzhardinge
2011-08-22 23:15   ` [PATCH 15/15] x86: use cmpxchg_flag() where applicable Jeremy Fitzhardinge

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