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=-18.7 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 0652CC07E9B for ; Sun, 4 Jul 2021 07:17:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3B396162A for ; Sun, 4 Jul 2021 07:17:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229794AbhGDHT6 (ORCPT ); Sun, 4 Jul 2021 03:19:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229740AbhGDHTx (ORCPT ); Sun, 4 Jul 2021 03:19:53 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CD87C061765 for ; Sun, 4 Jul 2021 00:17:18 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id h6so7230744plf.11 for ; Sun, 04 Jul 2021 00:17:18 -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=sPPIAp6bykeHv8kNEiNQSCH3ZxxoXifu1yRZOpcwWPNEr0fyMcMBODJMeCbSdX3rQR wjMbs3m5gsKDPv5lyx/QgE5e2gxb+9Dzh2piLOFCcTLAPDOMc6lo3y1SidC97ncjri4o 39iHTnXCslYQiJVFWKaSbc0leC98lBqCqkszir2CJHxzKPpOCX7EAm3Xo99jF5HyZGBZ 95CLan0JYfl6yZNUYfl8UaQgFQxYilZgLOZNB4SjbzRYJ5Nt5jcJiXgb1jZLKZDRsk80 iatwVhlW8M9/y6n7k8g5bLXC+MUMOGRCNBcy+fsRX4q+lU/H4Zb9fWXiW5tIloDKZd2U Pi6Q== 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=IL/BPfUnhvO6iObUP1torL4XZF3eeV3ouupkrbJK/Ai6BkKYrR0s6TqWIknNDhDH6V YUfBcgu8+AJo+Q1v9K0NtsABv8lonuIQq0gLA+N5ZdyCTir+kMOhUosGdpgIH70y4hhY HUgn/2fHv8A76QSBGVxVG7bQGEQQQ62Tgaw1rRoXrSGhOAJLWbaOX7CArWm5kZW3sqmz /ciCpznxGaT7sfbeHnrti6cpu79EAFDI3lki2sstnU2Sg4q+QzsJgAea6lhjhvCrv6tr cfnV7vn2l0pLptfuSL8MihdWWyxAEHGkQHBjZqDJWhBLn+nfPqX+jZc9f+kCAGDwwYws lpeA== X-Gm-Message-State: AOAM531RBE3TPZvRin/FirLk7v03JphCrPsRJKoDt6737tV+o5aGCgV2 d2SXVA20/4vP5PhIBsN25oPrJw== X-Google-Smtp-Source: ABdhPJzUFCWdKrT5LqvA16eca5FTWrFAEQFxu73CU4ERAiEVgUNZaIdSuqJv3g3yMzx1OBcIywsEvg== X-Received: by 2002:a17:90b:1284:: with SMTP id fw4mr8381195pjb.74.1625383038146; Sun, 04 Jul 2021 00:17:18 -0700 (PDT) Received: from localhost ([103.207.71.35]) by smtp.gmail.com with ESMTPSA id z7sm8588734pfn.36.2021.07.04.00.17.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 04 Jul 2021 00:17:17 -0700 (PDT) From: Leo Yan To: Arnaldo Carvalho de Melo , Peter Zijlstra , Adrian Hunter , 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 v3 04/10] perf/x86: Add barrier after updating bts Date: Sun, 4 Jul 2021 15:16:38 +0800 Message-Id: <20210704071644.107397-5-leo.yan@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210704071644.107397-1-leo.yan@linaro.org> References: <20210704071644.107397-1-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