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=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 30287C76188 for ; Fri, 19 Jul 2019 04:20:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 021062184E for ; Fri, 19 Jul 2019 04:20:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563510041; bh=WIb8G95L+YAnnb0aPBsyOH9LxsBWBZI1bIEaN89U1NQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1S1DonjRg8bpqjwBRIUMNgV3C8C+OK5KKMx88f0IEBp2+f50cBo5FIlvZWw+i6RBq 0WHO+9K9F8Cp8k/8N3rrRbp3QMN+2Lq92zJ4PozrGLDRSOxA2VBMNLyzLN999Thf3G s1zj11EoI3lX6RFYibyYO1Quybq7x6MOLVil8zVk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730479AbfGSEMd (ORCPT ); Fri, 19 Jul 2019 00:12:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:47802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388846AbfGSEM2 (ORCPT ); Fri, 19 Jul 2019 00:12:28 -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 1E92221873; Fri, 19 Jul 2019 04:12:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509548; bh=WIb8G95L+YAnnb0aPBsyOH9LxsBWBZI1bIEaN89U1NQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x1MmDr6Djxl+R7x4hGdsex0Wnq5v8o9NVY7s9fFs3Hbt9wZrxJQQUmQzq6thhjKnC +VxbUqDCiit0+AYeHk8CMBI6fK6jsUpPH1nmn6hBOlb2HGRH/ehw+ER6FVw9CfHpB0 vwTY52QFZO1Yobhx8/A9rwfHQIXIqzs5nbBafrWk= 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 4.14 43/60] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Fri, 19 Jul 2019 00:10:52 -0400 Message-Id: <20190719041109.18262-43-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719041109.18262-1-sashal@kernel.org> References: <20190719041109.18262-1-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 3c3f3e029e33..2ecb86876f10 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