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[209.132.180.67]) by mx.google.com with ESMTP id e3si18083209pgs.37.2019.04.24.10.23.33; Wed, 24 Apr 2019 10:23:48 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=z+nGqvZj; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389483AbfDXRWC (ORCPT + 99 others); Wed, 24 Apr 2019 13:22:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:47344 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389068AbfDXRVy (ORCPT ); Wed, 24 Apr 2019 13:21:54 -0400 Received: from localhost (62-193-50-229.as16211.net [62.193.50.229]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 610DA205ED; Wed, 24 Apr 2019 17:21:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126514; bh=6Bd+bYLwZzoxqnD655HN2BqVQ+UKE9SMsQRodzDow3c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z+nGqvZjHOnie7jKyDKN8sVuDTvNzNWqvR87XegArLaJbVr4iWUA2xn7g4kMD9wMX HwZmAJlrADnh+2LyQDO63+0XaGy2FVw81e9rVNC0XrKW3IZ9dxULRLihvc1GGJPmHc dN46ZK5Y+1npNumcSpO/AJ3zRzDoqjWLRHNQW/dU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephane Eranian , "Peter Zijlstra (Intel)" , Andi Kleen , Jiri Olsa , Kan Liang , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 4.4 098/168] perf/core: Restore mmap record type correctly Date: Wed, 24 Apr 2019 19:09:02 +0200 Message-Id: <20190424170929.476908531@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170923.452349382@linuxfoundation.org> References: <20190424170923.452349382@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ 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 e53dfb5b826e..17230ca00bd4 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5998,6 +5998,7 @@ 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)) @@ -6041,6 +6042,7 @@ 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