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=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 DB91BC76188 for ; Fri, 19 Jul 2019 04:14:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0FBF21882 for ; Fri, 19 Jul 2019 04:14:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509650; bh=LyqcIpqQVtgDziALXcmUJUO8gefcTIwRNGEHPZNzCEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zksEnGJszXEZRrFbOPBtKvZW3wiIftvzlzpWh6fAJjuUeT5RdET4gWwSW8CgakC20 7xMD73YkegVpetRmBeKfx60W+qDTgUMsrlRWBIW4igAd1GMtZIaw+PN4SihRqZoRSU nPVDYMxwGSB/A/8LI6Nm11nUQUXxjVQU+mdfEwlQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389577AbfGSEOJ (ORCPT ); Fri, 19 Jul 2019 00:14:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:50162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389539AbfGSEOH (ORCPT ); Fri, 19 Jul 2019 00:14:07 -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 3A55321882; Fri, 19 Jul 2019 04:14:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509646; bh=LyqcIpqQVtgDziALXcmUJUO8gefcTIwRNGEHPZNzCEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SZ3CI6bHtmnFVWW4YwEYu5sFhDzSa14D6qV3aBY2pI0tULj1xHLIc9+JGneltb2w+ S8S7HsvBA5oGM9NDusW6UmAoBSLV7gBFyDw3TcIaMKdnKaJF6BDRwYtW95W/Wlt6So 8TJa+56f4l7ol3twbjHMW1yvAVILiuSYJLxqrYKM= 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 4.9 35/45] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Fri, 19 Jul 2019 00:12:54 -0400 Message-Id: <20190719041304.18849-35-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719041304.18849-1-sashal@kernel.org> References: <20190719041304.18849-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review 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: 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 0c5ce44f723f..e5d6e6584001 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