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,USER_AGENT_GIT autolearn=unavailable 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 DFCBCC07E9B for ; Sun, 11 Jul 2021 10:41:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C596E6120D for ; Sun, 11 Jul 2021 10:41:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232466AbhGKKoR (ORCPT ); Sun, 11 Jul 2021 06:44:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232380AbhGKKoP (ORCPT ); Sun, 11 Jul 2021 06:44:15 -0400 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90DACC0613E5 for ; Sun, 11 Jul 2021 03:41:28 -0700 (PDT) Received: by mail-pg1-x533.google.com with SMTP id d12so14947933pgd.9 for ; Sun, 11 Jul 2021 03:41:28 -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=lyx0w/3i2J+y8CQc61EkPiIT6/dGLPzkaz7rfy+3+zdS2LKYhCN3ohFbBOQVnkr5vo c2QSHAkUQmYjofvTN++VJ8GVQlmbwsW/LHW82wh4QnkGR8pye+CS6TAQDUQUnd3Cwogk HNhZAvfFkccsVf++cXdroo8L9TMDDQzJTJjkuzpuz3Ysh+WXgzQzQ6cEsgs387G+liSe 0YRNVEQJyrH8s6PyNWZ7gQnmGD8BwkOHe0yOdZVXvAz+26Tjns4lpRZQVkZqrmNMKMvL JNEzSOgyosIHx1ZjVZlafGpAY1c22KJvTAf946Df3Ic2yJcQdUgzaA1UwDVMSsHL+VyA 5j1A== 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=Pdn+NbPTczsDRcZ7p02DBj1dSYdY7TSFgS/XVJoj8+ZSnrRT1y3JHrljxE7SsvfWmZ vovZT5510OnRCoilTGWeKTPbg1IRfel3nhxZsFJKwNE2D/dnENaDmBTnejAk5PUvg/uZ uJxBgn5pG1Slgx2ufBiyUSuXcg0q+vnF5Ecn4UOhc6f6iybKJX9Q07QC2gDq47TG6/6a 44F5xEO1YIAIbpwSds8yTb7d0Ahz5op2BjA2c7Md4gSQEZ9tCmL/juTMJLjzDyJ/amRg s7QTsTiByZKWvYo6S/Iq2jKesaKWeiLO+sB6d6QSaeKbjVhrNHEfIAs33pUz0ysy08KK aI5g== X-Gm-Message-State: AOAM533shfcQ5d27CyBDAPTNuvjB9JfomcEodyZkB3RYJ8QzARrDwmve Y8ZLXdmN139VQk/KdnydDjuOUw== X-Google-Smtp-Source: ABdhPJy7rSDkFVxHKzcS361rBBVWk82TUHhXPNVEgieYnRflyQ2XrW4SpdiE8S9LYx0A8Mr01spdNA== X-Received: by 2002:a63:e211:: with SMTP id q17mr25685112pgh.363.1626000088096; Sun, 11 Jul 2021 03:41:28 -0700 (PDT) Received: from localhost ([103.127.241.250]) by smtp.gmail.com with ESMTPSA id x13sm10181726pjh.30.2021.07.11.03.41.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 03:41:27 -0700 (PDT) From: Leo Yan To: Arnaldo Carvalho de Melo , Adrian Hunter , Peter Zijlstra , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Mathieu Poirier , Suzuki K Poulose , Mike Leach , 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 v4 04/11] perf/x86: Add barrier after updating bts Date: Sun, 11 Jul 2021 18:40:58 +0800 Message-Id: <20210711104105.505728-5-leo.yan@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210711104105.505728-1-leo.yan@linaro.org> References: <20210711104105.505728-1-leo.yan@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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