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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 58218C76186 for ; Mon, 29 Jul 2019 19:37:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20DF921851 for ; Mon, 29 Jul 2019 19:37:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564429033; bh=MvqptLD9VB/lA821+ZdkiJsOBXA/f2qPI6w8Qu3B/wg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NO9eCJwOyr9ltCfvN6+7YDGdKcN8Bi5IpAZ2OgW64y03LrYNLT7Gw+4eOLCpM02HO X3nfPi1aIjue1LMCIanqeKGFLbbJG6xXPixtOqbu3EZh3m7r7o6tS/e5UZm40nwzWI nwHy80PgqCcVfuIHelDDnEK3+XZYNUv0tpKyQxCE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388620AbfG2ThI (ORCPT ); Mon, 29 Jul 2019 15:37:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:51646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388480AbfG2ThI (ORCPT ); Mon, 29 Jul 2019 15:37:08 -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 B559A2070B; Mon, 29 Jul 2019 19:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564429027; bh=MvqptLD9VB/lA821+ZdkiJsOBXA/f2qPI6w8Qu3B/wg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V6RUTZP1x1SGpwOBHXLEIteMrD14sTDKBGp+L/H7xdFT/cOkN9qJqODNp/GIMoQkz s+UuXIQLiLUBS9oXnRZVjjQhLq3zGEYPNSzVbkXhvaMiwAavqI00FsUYhn+lkRhDme Lrvtv1pGcEwfDGTYfh7pTzWM1kMqbSFZw83ZjCRo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, 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 4.14 260/293] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Mon, 29 Jul 2019 21:22:31 +0200 Message-Id: <20190729190844.333962819@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190729190820.321094988@linuxfoundation.org> References: <20190729190820.321094988@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ 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