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=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 A6EBCC4363D for ; Tue, 22 Sep 2020 01:26:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D5A423A6A for ; Tue, 22 Sep 2020 01:26:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726702AbgIVB0V (ORCPT ); Mon, 21 Sep 2020 21:26:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:56682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729550AbgIVBYw (ORCPT ); Mon, 21 Sep 2020 21:24:52 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7A4E623AC4; Tue, 22 Sep 2020 01:24:52 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94) (envelope-from ) id 1kKX35-001sLD-Ht; Mon, 21 Sep 2020 21:24:51 -0400 Message-ID: <20200922012451.430245414@goodmis.org> User-Agent: quilt/0.66 Date: Mon, 21 Sep 2020 21:24:24 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Xianting Tian Subject: [for-next][PATCH 10/26] tracing: Use __this_cpu_read() in trace_buffered_event_enable() References: <20200922012414.115238201@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xianting Tian The code is executed with preemption disabled, so it's safe to use __this_cpu_read(). Link: https://lkml.kernel.org/r/20200813112803.12256-1-tian.xianting@h3c.com Signed-off-by: Xianting Tian Signed-off-by: Steven Rostedt (VMware) --- 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 8fac7d6db222..1c4ca25944ba 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2511,7 +2511,7 @@ 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(); -- 2.28.0