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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 17E5BC76196 for ; Fri, 19 Jul 2019 04:09:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E653C218B6 for ; Fri, 19 Jul 2019 04:09:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509396; bh=UuK/5RE4yTGtwCE302giy1ZOksBF6Zv4hJpWtIvFXkU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=i1Vw/zEHBY9M1xxBIzb37Jt+3yATxS58YekYN+UNxSKYhFk8hRwJ75laFYx07uKXP VHAgMMSOQx1Zc21uQSFRob4FXRIrw12vFOb6XmpdrzRQJP3NTcaYrWiAcqWTE2LfKC qS2SxARMllYjNdQZRBF6U/dDm/8L/NNnaLH2nfPY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732803AbfGSEJz (ORCPT ); Fri, 19 Jul 2019 00:09:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:44518 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387809AbfGSEJy (ORCPT ); Fri, 19 Jul 2019 00:09:54 -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 A70FE21872; Fri, 19 Jul 2019 04:09:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509394; bh=UuK/5RE4yTGtwCE302giy1ZOksBF6Zv4hJpWtIvFXkU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dVPe+w42Slsb74TtBCYKYppVQWGfkX2gevtiAwI893vbmU+hfMRy4LSDAZ+aBjICS ZOmHBZQ4B5ZTcL/Y0/DzZ60UA+HWXsHXIuH0XtUXe+Y5t7uydu8yjcPkl8cZ3HD4wk 4y7hPZuHwbiYAhuJm/bOjUKU3Tpv66cilGwcCZdo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Numfor Mbiziwo-Tiapo , Alexander Shishkin , Ian Rogers , Jiri Olsa , Mark Drayton , Namhyung Kim , Peter Zijlstra , Song Liu , Stephane Eranian , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 4.19 071/101] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Fri, 19 Jul 2019 00:07:02 -0400 Message-Id: <20190719040732.17285-71-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719040732.17285-1-sashal@kernel.org> References: <20190719040732.17285-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Numfor Mbiziwo-Tiapo [ Upstream commit 4e4cf62b37da5ff45c904a3acf242ab29ed5881d ] Running the 'perf test' command after building perf with a memory sanitizer causes a warning that says: WARNING: MemorySanitizer: use-of-uninitialized-value... in mmap-thread-lookup.c Initializing the go variable to 0 silences this harmless warning. Committer warning: This was harmless, just a simple test writing whatever was at that sizeof(int) memory area just to signal another thread blocked reading that file created with pipe(). Initialize it tho so that we don't get this warning. Signed-off-by: Numfor Mbiziwo-Tiapo Cc: Alexander Shishkin Cc: Ian Rogers Cc: Jiri Olsa Cc: Mark Drayton Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Song Liu Cc: Stephane Eranian Link: http://lkml.kernel.org/r/20190702173716.181223-1-nums@google.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/tests/mmap-thread-lookup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c index b1af2499a3c9..7a9b123c7bfc 100644 --- a/tools/perf/tests/mmap-thread-lookup.c +++ b/tools/perf/tests/mmap-thread-lookup.c @@ -52,7 +52,7 @@ static void *thread_fn(void *arg) { struct thread_data *td = arg; ssize_t ret; - int go; + int go = 0; if (thread_init(td)) return NULL; -- 2.20.1