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=-18.8 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, 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 7F4ECC47093 for ; Wed, 2 Jun 2021 10:30:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65EE5613D0 for ; Wed, 2 Jun 2021 10:30:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232677AbhFBKcQ (ORCPT ); Wed, 2 Jun 2021 06:32:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232502AbhFBKcL (ORCPT ); Wed, 2 Jun 2021 06:32:11 -0400 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 162F5C061574 for ; Wed, 2 Jun 2021 03:30:29 -0700 (PDT) Received: by mail-pf1-x42d.google.com with SMTP id s14so947032pfd.9 for ; Wed, 02 Jun 2021 03:30:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Q5Wf8ghZ23c6vSvSmNVjb2NVOeSumBPmpt+tM4X+4G0=; b=vtKgbR14cR7y62vFxXZgh6OuBU1qzmZhTJ2Wh0fFfsK74YBw9tRK3mWWU9u22JQPdk gFmXg/EUtcHHVskldrPBIeKf/U8iU1jNTaFQF4J0rz0MxbYPr42ClzwSInc8+A13AGmQ l5nIgiDgpl5w1iGPge+sti8zpRxzlakhwNWB16gH1UvMHwn99Bq3btm8IVTPAOdjcWgo fwIZ7l/mVqNg2uJhKiz92FsNiYFP9PS/yGX6jsmcqgEPRKdv3LlpmS0oLUKpvzzgnD8g JklAAJtSqviT30Rzlt+iqkHuPB4RQ2VVdwXS7TMNHkEaP76AMl0EXoNvd2d5E1ot8w+Z qunQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Q5Wf8ghZ23c6vSvSmNVjb2NVOeSumBPmpt+tM4X+4G0=; b=ZwQPWYpPM9XuEgRilhYL2No3q6/InMiv0TkZPQpT7met8+oPYf1naUwPWwP95RmHPs ifn4LFbIUDyz5fF376xYSRsH5TGXTHFIrZyoGRovFtsSRqaJm/jl8kUA6m1F6Fpp6nF6 +eleCRIwapdDpxxWBJKEVlcEpZFHAboB1ns2S2yHL9igi3ObVJzToncnvqj5XNxY2A1+ V2eZut/5KU0HwUrdNcSbl2Vx/+79dUmS8WzBZ9O7yrC4kmK5ye7LnqFFMW1gPrtTxD2d m030P14tLwPcNk5d1PDNAgMxomdtPPrWOMlSqyzmlU2aQaJFC74fgKFJzj2k8Q1BG+gK AnYw== X-Gm-Message-State: AOAM5300MSadpLsn5ivT14fLUcCsuRXPl5ry6o1rfzP4bFxpDLu8EnD7 NwUaG0eQLX0ZTghWzhlWguSFfg== X-Google-Smtp-Source: ABdhPJyW5O+lp5JviQc20HzDNUJCnF1tag3CzpppyeQ7jlEx5vWwxASM3CiSXM5Fvsi9co5grxHOOA== X-Received: by 2002:a63:a602:: with SMTP id t2mr32573804pge.320.1622629828662; Wed, 02 Jun 2021 03:30:28 -0700 (PDT) Received: from localhost (ec2-18-167-84-74.ap-east-1.compute.amazonaws.com. [18.167.84.74]) by smtp.gmail.com with ESMTPSA id u21sm15385901pfh.163.2021.06.02.03.30.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 03:30:28 -0700 (PDT) From: Leo Yan To: Arnaldo Carvalho de Melo , Peter Zijlstra , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , x86@kernel.org, "H. Peter Anvin" , Mathieu Poirier , Suzuki K Poulose , Mike Leach , Adrian Hunter , Andi Kleen , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org Cc: Leo Yan Subject: [PATCH v2 4/8] perf/x86: Add barrier after updating bts Date: Wed, 2 Jun 2021 18:30:03 +0800 Message-Id: <20210602103007.184993-5-leo.yan@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210602103007.184993-1-leo.yan@linaro.org> References: <20210602103007.184993-1-leo.yan@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org Add barrier wmb() to separate the AUX data store and aux_head store. Signed-off-by: Leo Yan --- arch/x86/events/intel/bts.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c index 6320d2cfd9d3..4a015d160bc5 100644 --- a/arch/x86/events/intel/bts.c +++ b/arch/x86/events/intel/bts.c @@ -209,6 +209,9 @@ static void bts_update(struct bts_ctx *bts) } else { local_set(&buf->data_size, head); } + + /* The WMB separates data store and aux_head store matches. */ + wmb(); } static int -- 2.25.1