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=-11.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,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 CA1E8C43381 for ; Fri, 22 Mar 2019 12:09:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9719920830 for ; Fri, 22 Mar 2019 12:09:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553256599; bh=keZPob0LfMUmmYsdhVaKAuvNoAflxEJfpZDXv3I0eTk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kSnW9JnSTl+NX0tCHeW8i9JzspYfuSKO+V21GAhVZKdVzN0CuYAfJipCnfitVrTjG 9pjfZVDASdyzplsExAxfvhpypd0XjA5mOFo6GzVk9ar5MIi1uFTVGUGOD84XcMm8k+ 7fSAEDyX+YkfbuLQRwEM7KCVioX2ow29YG7Vzbfs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388984AbfCVMJ6 (ORCPT ); Fri, 22 Mar 2019 08:09:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:48330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389394AbfCVMJu (ORCPT ); Fri, 22 Mar 2019 08:09:50 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 E0CF92082C; Fri, 22 Mar 2019 12:09:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553256590; bh=keZPob0LfMUmmYsdhVaKAuvNoAflxEJfpZDXv3I0eTk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T1b6csUn2lquHAAvaqeCVqhaPD1Fk0bu+CgWDOzDRbk11Pau4nnccGMG57IbBE8nD A9fE1FPrDmSHVfn8BYXQUGQWfucSzVt2B3jrGjzGxa++ESaKVaD5Xqscr4A3jV0En8 7x/MOH+iJ/Ovq5ThY/rgoqxURvE/BKZqRarMFrN8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Jiri Olsa , Arnaldo Carvalho de Melo Subject: [PATCH 4.19 258/280] perf intel-pt: Fix divide by zero when TSC is not available Date: Fri, 22 Mar 2019 12:16:51 +0100 Message-Id: <20190322111343.454235928@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111306.356185024@linuxfoundation.org> References: <20190322111306.356185024@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Adrian Hunter commit 076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa upstream. 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 Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/intel-pt.c | 2 ++ 1 file changed, 2 insertions(+) --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -2507,6 +2507,8 @@ int intel_pt_process_auxtrace_info(union } 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;