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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 8C341C43381 for ; Sat, 30 Mar 2019 00:57:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D549217F5 for ; Sat, 30 Mar 2019 00:57:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553907457; bh=KRxjBywvRr6w3hN7I+Akccm3xYsi0gT6nZakM0G78BY=; h=From:To:Cc:Subject:Date:List-ID:From; b=F4CNpKhKWxM3lSkdbaY4Vew052tcSkfO/tVJ4IuPeD7L4w/es85JeOoA+z6JN4A+Y mQOl1QjxZTKq5RoIr7ordPgg0S899zKWWWC+vOY4uqhuIzNjGEazR0GSjJck9GbSGC WwdsZ58gpWZuHiOvLr9m2TI+bifla0dpvYG6T980= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731822AbfC3A5g (ORCPT ); Fri, 29 Mar 2019 20:57:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:37828 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731765AbfC3A5d (ORCPT ); Fri, 29 Mar 2019 20:57:33 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1DC902064A; Sat, 30 Mar 2019 00:57:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553907453; bh=KRxjBywvRr6w3hN7I+Akccm3xYsi0gT6nZakM0G78BY=; h=From:To:Cc:Subject:Date:From; b=ACLCdR8n5WDG5rld2fh7u1CogMnHMBM4qQhJyrMpkyWzuRzJxoLQ6e0hyl+YucA6X BoQgjl5/xl18/ZT8LwNQ8K3CCIkxXaX7OEn88Hr8jNEiy5E05mYnJ/eB9ZaVzzbPx3 aXbQpFOpGyj0y9s4XbSiAqRuKSp2eN2F3o/h3tjw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stephane Eranian , Andi Kleen , Jiri Olsa , Kan Liang , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 3.18 01/15] perf/core: Restore mmap record type correctly Date: Fri, 29 Mar 2019 20:57:16 -0400 Message-Id: <20190330005730.28777-1-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephane Eranian [ Upstream commit d9c1bb2f6a2157b38e8eb63af437cb22701d31ee ] On mmap(), perf_events generates a RECORD_MMAP record and then checks which events are interested in this record. There are currently 2 versions of mmap records: RECORD_MMAP and RECORD_MMAP2. MMAP2 is larger. The event configuration controls which version the user level tool accepts. If the event->attr.mmap2=1 field then MMAP2 record is returned. The perf_event_mmap_output() takes care of this. It checks attr->mmap2 and corrects the record fields before putting it in the sampling buffer of the event. At the end the function restores the modified MMAP record fields. The problem is that the function restores the size but not the type. Thus, if a subsequent event only accepts MMAP type, then it would instead receive an MMAP2 record with a size of MMAP record. This patch fixes the problem by restoring the record type on exit. Signed-off-by: Stephane Eranian Acked-by: Peter Zijlstra (Intel) Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Fixes: 13d7a2410fa6 ("perf: Add attr->mmap2 attribute to an event") Link: http://lkml.kernel.org/r/20190307185233.225521-1-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- kernel/events/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index fd8dea2b36ec..41d83a9aacaf 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5533,6 +5533,7 @@ static void perf_event_mmap_output(struct perf_event *event, struct perf_output_handle handle; struct perf_sample_data sample; int size = mmap_event->event_id.header.size; + u32 type = mmap_event->event_id.header.type; int ret; if (!perf_event_mmap_match(event, data)) @@ -5576,6 +5577,7 @@ static void perf_event_mmap_output(struct perf_event *event, perf_output_end(&handle); out: mmap_event->event_id.header.size = size; + mmap_event->event_id.header.type = type; } static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) -- 2.19.1