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=-14.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 6959FC43381 for ; Thu, 7 Mar 2019 17:45:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 30D3020854 for ; Thu, 7 Mar 2019 17:45:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551980720; bh=3Wy+0CezS4nhz8tuSbpEx5UNaO/YUV8XnS1v6THtFfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GMtogfk6++XGsky/GIzT8S4APrcn95qylxSz+pTylG6WkfiKx76JomljN+6Zsg0VQ 4pmhqgOJDnDjDsBbAPEjt/qDNI+ef2ghZ/cmygSmmtCftgEkjFtdM4ehAs8EkIpCK+ bY+ClvZw9lBi+kqvntKlUa7H8uf3BgVftesy7YZE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726618AbfCGRpS (ORCPT ); Thu, 7 Mar 2019 12:45:18 -0500 Received: from mail.kernel.org ([198.145.29.99]:37256 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726180AbfCGRpQ (ORCPT ); Thu, 7 Mar 2019 12:45:16 -0500 Received: from quaco.ghostprotocols.net (unknown [190.15.121.82]) (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 E669B20854; Thu, 7 Mar 2019 17:45:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551980716; bh=3Wy+0CezS4nhz8tuSbpEx5UNaO/YUV8XnS1v6THtFfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TYN9trXqD39xKSdrUbOwXaXymLH/a0sfMuGzK5VRE6RUB5UqYtAO7+X4L8SWg1B0n kpQOCkekMr2hBQqBwz2MmHtWsfQ63An+BrTao08xK00QDrWd/UPMDeNzUREzFb0+Ir RrltaN4J967G8I1p4ad2Zj7kbc4y6P8Ah+HD09+w= From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Adrian Hunter , Jiri Olsa , stable@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH 07/35] perf intel-pt: Fix divide by zero when TSC is not available Date: Thu, 7 Mar 2019 14:44:05 -0300 Message-Id: <20190307174433.28819-8-acme@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190307174433.28819-1-acme@kernel.org> References: <20190307174433.28819-1-acme@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Adrian Hunter When TSC is not available, "timeless" decoding is used but a divide by zero occurs if perf_time_to_tsc() is called. Ensure the divisor is not zero. Signed-off-by: Adrian Hunter Cc: Jiri Olsa Cc: stable@vger.kernel.org # v4.9+ Link: https://lkml.kernel.org/n/tip-1i4j0wqoc8vlbkcizqqxpsf4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/intel-pt.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 3b497bab4324..6d288237887b 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -2531,6 +2531,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event, } pt->timeless_decoding = intel_pt_timeless_decoding(pt); + if (pt->timeless_decoding && !pt->tc.time_mult) + pt->tc.time_mult = 1; pt->have_tsc = intel_pt_have_tsc(pt); pt->sampling_mode = false; pt->est_tsc = !pt->timeless_decoding; -- 2.20.1