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=-9.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,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 C8795C43381 for ; Sat, 23 Feb 2019 21:17:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 942A320651 for ; Sat, 23 Feb 2019 21:17:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550956676; bh=lon78E5/PyTXTC8n/Q0aWHWDnXYbMW2phqnVGuvFOPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fRxNz36Zn744ZVwR9uuhUUgKlYP5nKetYYOOltCB+hz8DcnZp6cbhu8T8TkDoXjNM N1UtdCTyBXTbi6QmpucN8+hrnpnDKKAhkRSixDyTiUlLiXukw9vqZarG91dhQZlvsP WSmWmprHMRF/+lXZRt9hwZhzAbwZnYGRJh1owbEM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729828AbfBWVRz (ORCPT ); Sat, 23 Feb 2019 16:17:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:45858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729642AbfBWVJ7 (ORCPT ); Sat, 23 Feb 2019 16:09:59 -0500 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 907002086C; Sat, 23 Feb 2019 21:09:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550956198; bh=lon78E5/PyTXTC8n/Q0aWHWDnXYbMW2phqnVGuvFOPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HjUy8Fg/VSlNZySqChbpyCBwilTEO4Jc6WArPBHjjhodkBRz2F7iED62OJDym9cuv ABd4/EHSuq00Om13K+ZChiaiMUCr8p1rLXIM26/tM7resaDSMfGd1lhaYGI1Df+3Y8 A6G6eMl9VXZwY5QlMRa4y2USjCW4aCEF3ePD/fx4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stephane Eranian , Andi Kleen , Kan Liang , Peter Zijlstra , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 4.9 04/32] perf tools: Handle TOPOLOGY headers with no CPU Date: Sat, 23 Feb 2019 16:09:23 -0500 Message-Id: <20190223210951.202268-4-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190223210951.202268-1-sashal@kernel.org> References: <20190223210951.202268-1-sashal@kernel.org> MIME-Version: 1.0 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 1497e804d1a6e2bd9107ddf64b0310449f4673eb ] This patch fixes an issue in cpumap.c when used with the TOPOLOGY header. In some configurations, some NUMA nodes may have no CPU (empty cpulist). Yet a cpumap map must be created otherwise perf abort with an error. This patch handles this case by creating a dummy map. Before: $ perf record -o - -e cycles noploop 2 | perf script -i - 0x6e8 [0x6c]: failed to process type: 80 After: $ perf record -o - -e cycles noploop 2 | perf script -i - noploop for 2 seconds Signed-off-by: Stephane Eranian Acked-by: Jiri Olsa Cc: Andi Kleen Cc: Kan Liang Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1547885559-1657-1-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/cpumap.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 2c0b52264a468..a625cb1500f92 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -129,7 +129,12 @@ struct cpu_map *cpu_map__new(const char *cpu_list) if (!cpu_list) return cpu_map__read_all_cpu_map(); - if (!isdigit(*cpu_list)) + /* + * must handle the case of empty cpumap to cover + * TOPOLOGY header for NUMA nodes with no CPU + * ( e.g., because of CPU hotplug) + */ + if (!isdigit(*cpu_list) && *cpu_list != '\0') goto out; while (isdigit(*cpu_list)) { @@ -176,8 +181,10 @@ struct cpu_map *cpu_map__new(const char *cpu_list) if (nr_cpus > 0) cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); - else + else if (*cpu_list != '\0') cpus = cpu_map__default_new(); + else + cpus = cpu_map__dummy_new(); invalid: free(tmp_cpus); out: -- 2.19.1