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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 1B868C433DF for ; Thu, 13 Aug 2020 12:55:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB5A420791 for ; Thu, 13 Aug 2020 12:55:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726531AbgHMMzA (ORCPT ); Thu, 13 Aug 2020 08:55:00 -0400 Received: from smtp.h3c.com ([60.191.123.50]:26134 "EHLO h3cspam02-ex.h3c.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726131AbgHMMzA (ORCPT ); Thu, 13 Aug 2020 08:55:00 -0400 X-Greylist: delayed 4762 seconds by postgrey-1.27 at vger.kernel.org; Thu, 13 Aug 2020 08:54:59 EDT Received: from h3cspam02-ex.h3c.com (localhost [127.0.0.2] (may be forged)) by h3cspam02-ex.h3c.com with ESMTP id 07DBZXOS027013 for ; Thu, 13 Aug 2020 19:35:33 +0800 (GMT-8) (envelope-from tian.xianting@h3c.com) Received: from DAG2EX03-BASE.srv.huawei-3com.com ([10.8.0.66]) by h3cspam02-ex.h3c.com with ESMTPS id 07DBYhDN026643 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 13 Aug 2020 19:34:43 +0800 (GMT-8) (envelope-from tian.xianting@h3c.com) Received: from localhost.localdomain (10.99.212.201) by DAG2EX03-BASE.srv.huawei-3com.com (10.8.0.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Thu, 13 Aug 2020 19:34:46 +0800 From: Xianting Tian To: , CC: , Xianting Tian Subject: [PATCH] tracing: use __this_cpu_read() in trace_buffered_event_enable() Date: Thu, 13 Aug 2020 19:28:03 +0800 Message-ID: <20200813112803.12256-1-tian.xianting@h3c.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.99.212.201] X-ClientProxiedBy: BJSMTP01-EX.srv.huawei-3com.com (10.63.20.132) To DAG2EX03-BASE.srv.huawei-3com.com (10.8.0.66) X-DNSRBL: X-MAIL: h3cspam02-ex.h3c.com 07DBYhDN026643 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The code is executed with preemption disabled, so it's safe to use __this_cpu_read(). Signed-off-by: Xianting Tian --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index bb6226972..7d0d71ce9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2514,7 +2514,7 @@ void trace_buffered_event_enable(void) preempt_disable(); if (cpu == smp_processor_id() && - this_cpu_read(trace_buffered_event) != + __this_cpu_read(trace_buffered_event) != per_cpu(trace_buffered_event, cpu)) WARN_ON_ONCE(1); preempt_enable(); -- 2.17.1