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,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 DE6B9C76195 for ; Fri, 19 Jul 2019 04:16:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B54A221851 for ; Fri, 19 Jul 2019 04:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509772; bh=siwxKKu+OuuZbJfFpRcm+JZ/N3FRtfv/aUBHufH8Ltw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iv1Bf+u7V7ZaUC6jBLVgGocr7a7DsujUltbvmGHvrDdKLbbeKH+YHZPatFFJeyXyX mU3emHEVM9Oea3US6xBIF9kbC/+ECo4K0p95bJAXt9U5hq1Yvo1EMjPq++ykBQFlCE Zrm6qJxAkGc7sQA417oq5fDGGv7+Lm4T/RbndoOQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390074AbfGSEPV (ORCPT ); Fri, 19 Jul 2019 00:15:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:51610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390069AbfGSEPU (ORCPT ); Fri, 19 Jul 2019 00:15:20 -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 CF6B221873; Fri, 19 Jul 2019 04:15:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509720; bh=siwxKKu+OuuZbJfFpRcm+JZ/N3FRtfv/aUBHufH8Ltw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K+FXEgxv94b/JG4VMV0XxtUdwKBFT31W79wb7Nj+S/iTULBIQGN94eaI2+1W1gHZ5 B3jUn4GSA2Raqh66Lc1iWncTLnt5Kf7BnCJFWzggwMN1kLp2qpOY4mAKZhtWz+u92h AUX1GN4sJkP0WhiRWa6ShZUIoWi9cCCaJNYm8rAE= 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 4.4 27/35] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Fri, 19 Jul 2019 00:14:15 -0400 Message-Id: <20190719041423.19322-27-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719041423.19322-1-sashal@kernel.org> References: <20190719041423.19322-1-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 145050e2e544..195ba31e2f35 100644 --- a/tools/perf/tests/mmap-thread-lookup.c +++ b/tools/perf/tests/mmap-thread-lookup.c @@ -49,7 +49,7 @@ 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