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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 11B47C4338F for ; Thu, 5 Aug 2021 15:42:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8FEB61131 for ; Thu, 5 Aug 2021 15:42:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241840AbhHEPmS (ORCPT ); Thu, 5 Aug 2021 11:42:18 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:43596 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242210AbhHEPlf (ORCPT ); Thu, 5 Aug 2021 11:41:35 -0400 Message-ID: <20210805153953.451436647@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1628178080; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=nz6iNRswOxKTf/LxISV+nf59LcGBzNa2Ih1pkjs3ys4=; b=Jr3rf3/ClmhfcSeXDzQegoINdTpQYGjm5Nx0R0VUEV4FkajxPrpGPgJeILaqlM7HsbudbV 9rUolRf/gJQXMYpi61DQ8FL/irrdUOURwrCK73jp4lwv2HezUpVngC/aocseG0REW68rBX nk12jo+aNcKYl3O0y+MV6ZleOpSGSdR12XSzB2Qh9va3KxtmWvlmlwHpo21Q3T4OlwMcLQ 0IgR3JdOvSV+CgITk+jvJdQUr4jE54AUGUDStnLzUuSRD/5vq6z5dKzGEj5LP39/L6Cwos JemMex2GM0RV1NzO1ANMT8rr1G12hzDLTPO6QrgVf8eyYVLhRj3Pw2rIQsWjjw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1628178080; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=nz6iNRswOxKTf/LxISV+nf59LcGBzNa2Ih1pkjs3ys4=; b=fxge/jKfD14gmmNwNtNalnuICa5w5MCyeRFWOKUV28S4yqaV+gBUYfNdvIvgCRx73j1Pe0 fO2jfJ6Bk8MaYECw== Date: Thu, 05 Aug 2021 17:13:11 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Ingo Molnar , Juri Lelli , Steven Rostedt , Daniel Bristot de Oliveira , Will Deacon , Waiman Long , Boqun Feng , Sebastian Andrzej Siewior , Davidlohr Bueso , Mike Galbraith Subject: [patch V3 11/64] rtmutex: Switch to try_cmpxchg() References: <20210805151300.330412127@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner Allows the compiler to generate better code depending on the architecture. Suggested-by: Peter Zijlstra Signed-off-by: Thomas Gleixner --- kernel/locking/rtmutex.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -145,14 +145,14 @@ static __always_inline bool rt_mutex_cmp struct task_struct *old, struct task_struct *new) { - return cmpxchg_acquire(&lock->owner, old, new) == old; + return try_cmpxchg_acquire(&lock->owner, &old, new); } static __always_inline bool rt_mutex_cmpxchg_release(struct rt_mutex *lock, struct task_struct *old, struct task_struct *new) { - return cmpxchg_release(&lock->owner, old, new) == old; + return try_cmpxchg_release(&lock->owner, &old, new); } /*