From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 876E5C6778F for ; Wed, 25 Jul 2018 14:20:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 496852088E for ; Wed, 25 Jul 2018 14:20:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 496852088E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729219AbeGYPcX (ORCPT ); Wed, 25 Jul 2018 11:32:23 -0400 Received: from terminus.zytor.com ([198.137.202.136]:43279 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727881AbeGYPcW (ORCPT ); Wed, 25 Jul 2018 11:32:22 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id w6PEK5ZE399879 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 25 Jul 2018 07:20:05 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id w6PEK5gb399876; Wed, 25 Jul 2018 07:20:05 -0700 Date: Wed, 25 Jul 2018 07:20:05 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Waiman Long Message-ID: Cc: mingo@kernel.org, jmario@redhat.com, peterz@infradead.org, torvalds@linux-foundation.org, longman@redhat.com, tglx@linutronix.de, will.deacon@arm.com, linux-kernel@vger.kernel.org, hpa@zytor.com Reply-To: mingo@kernel.org, jmario@redhat.com, longman@redhat.com, peterz@infradead.org, torvalds@linux-foundation.org, tglx@linutronix.de, will.deacon@arm.com, linux-kernel@vger.kernel.org, hpa@zytor.com In-Reply-To: <1531858560-21547-1-git-send-email-longman@redhat.com> References: <1531858560-21547-1-git-send-email-longman@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:locking/urgent] locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin_unlock() assembly code Git-Commit-ID: c0dc373a780f4ec63e45a573b9551763abd8cd1a X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: c0dc373a780f4ec63e45a573b9551763abd8cd1a Gitweb: https://git.kernel.org/tip/c0dc373a780f4ec63e45a573b9551763abd8cd1a Author: Waiman Long AuthorDate: Tue, 17 Jul 2018 16:16:00 -0400 Committer: Ingo Molnar CommitDate: Wed, 25 Jul 2018 11:22:20 +0200 locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin_unlock() assembly code The LOCK_PREFIX macro should be used in the __raw_callee_save___pv_queued_spin_unlock() assembly code, so that the lock prefix can be patched out on UP systems. Signed-off-by: Waiman Long Signed-off-by: Peter Zijlstra (Intel) Cc: Joe Mario Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Will Deacon Link: http://lkml.kernel.org/r/1531858560-21547-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/qspinlock_paravirt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/qspinlock_paravirt.h b/arch/x86/include/asm/qspinlock_paravirt.h index 9ef5ee03d2d7..159622ee0674 100644 --- a/arch/x86/include/asm/qspinlock_paravirt.h +++ b/arch/x86/include/asm/qspinlock_paravirt.h @@ -43,7 +43,7 @@ asm (".pushsection .text;" "push %rdx;" "mov $0x1,%eax;" "xor %edx,%edx;" - "lock cmpxchg %dl,(%rdi);" + LOCK_PREFIX "cmpxchg %dl,(%rdi);" "cmp $0x1,%al;" "jne .slowpath;" "pop %rdx;"