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=-8.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 07A2AC33CB6 for ; Sat, 18 Jan 2020 03:06:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF9C524679 for ; Sat, 18 Jan 2020 03:06:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cT7tAvPz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730610AbgARDG1 (ORCPT ); Fri, 17 Jan 2020 22:06:27 -0500 Received: from mail-pg1-f194.google.com ([209.85.215.194]:35384 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727033AbgARDG0 (ORCPT ); Fri, 17 Jan 2020 22:06:26 -0500 Received: by mail-pg1-f194.google.com with SMTP id l24so12571753pgk.2; Fri, 17 Jan 2020 19:06:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:subject:message-id:mime-version:content-disposition :user-agent; bh=ZOS/QKfJuYHMcS4p5y33x0lWJFFfhgPkwQi+6BWE0/s=; b=cT7tAvPzEQGvP8FwNaSz5sJQJr16JuwCeKy76J7+0CXYibIXw5W9H3ImH/XF6Y1y2f l/CB6PhveH0EW7bldI3GYIsM5xB7dibtyGiLFyCwniQtWvLc2j6mQiNMs7Lhb29WT1Sc RzPCEeOd1QeCvdbDZAPv2glcGElX7NvwYG697Z5z6HvhQ9OFctcDGI0Dx/JP8HoP6A8b plDGQGF++TK5lj8ih3gcGHlBKGppcyMtH11TRDVoQMaUM23xvtRizceMkNmDqTXzi3f7 GQEFvEcCdDNv2CdQXITNzLcOIW4sYIOx83eNe7O/IQ/e5LNsP4HCuNTjvS8Vz1WjVx2U UIbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:mime-version :content-disposition:user-agent; bh=ZOS/QKfJuYHMcS4p5y33x0lWJFFfhgPkwQi+6BWE0/s=; b=iBWbwqQM6/5MCi/J+khlV4tMVJvhF9C4J9TNb1UvhszWHNt4Ir7cSvMRho68qVSGed Q/Po2Yjqs4Gra4SfbHPcSbTny7k87v8QcnYpmZBlISVbvEzE7aqdkz7zINx6bixOqw8s 5GIzYZiNqdpL6z4HCnjLI34Ivwqc9VmZf5udBYTKdpeqlpXGFUncnkmM26FKTw7XWh/a fPtgxe+Hovs8A4dSlsh3KLU2JdCE+mzKLKBjFhdpXj2Xt3gQmT48SsVJi3NP1qW1eqCo NlFF7YvARSdI2LwXQlSF89c/OaoBUmXw4SW9h8vIf6wF69ihZI2JCxy/W1WlbZSu4I2L j7Hg== X-Gm-Message-State: APjAAAUqr/7MVO4jBU7jKdR7Qd7+1gOnYjAxcqDWN8kN3NjIwmTWfinR 2/2/KVzsIgZt6FWlGT9d+g== X-Google-Smtp-Source: APXvYqynSuHb7zqQFO6TPM9eaLCNeLc6NMrMJ4WBFqPMvpJD0F/OdoY3zjM/mK1N3r4FVktNXKFNbg== X-Received: by 2002:a63:1c13:: with SMTP id c19mr49126467pgc.450.1579316786303; Fri, 17 Jan 2020 19:06:26 -0800 (PST) Received: from madhuparna-HP-Notebook ([2402:3a80:1ee0:feca:7477:122a:17db:72ef]) by smtp.gmail.com with ESMTPSA id s22sm184620pji.30.2020.01.17.19.06.21 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 17 Jan 2020 19:06:25 -0800 (PST) Date: Sat, 18 Jan 2020 08:36:18 +0530 From: Madhuparna Bhowmik To: peterz@infradead.org, --@madhuparna-HP-Notebook, mingo@redhat.com, -c@madhuparna-HP-Notebook, jolsa@redhat.com, linux-kernel@vger.kernel.org, joel@joelfernandes.org, rcu@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, frextrite@gmail.com Subject: [PATCH] events:core.c: Use built-in RCU list checking Message-ID: <20200118030618.GA28502@madhuparna-HP-Notebook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org list_for_each_entry_rcu has built-in RCU and lock checking. Pass cond argument to list_for_each_entry_rcu() to silence false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled by default. Signed-off-by: Madhuparna Bhowmik --- kernel/events/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 4ff86d57f9e5..04d28f3eb8df 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3760,7 +3760,8 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, raw_spin_lock(&ctx->lock); perf_pmu_disable(ctx->pmu); - list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { + list_for_each_entry_rcu(event, &ctx->event_list, event_entry, + lockdep_is_held(&ctx->lock)) { if (event->state != PERF_EVENT_STATE_ACTIVE) continue; -- 2.17.1