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 CA63CC76188 for ; Fri, 19 Jul 2019 04:05:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A50D12189F for ; Fri, 19 Jul 2019 04:05:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509151; bh=L3bfEAAL0Ysgipi+GDxrm8gZDpiTXGOXWVgDY9UE48k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=E0OROhj7uG2CBlbgkgvRXThLrJZIvvo5PDnTPuzg/MEnHdvONnDP38BR/3C/HdkwP 6z5zAwhANh6a01X/d1NK5SKYXQR9k853MbE8o9drvzRhyes8g6A8neASCnAh0lu7Uf qdAJsZ5TAJOS6IaPdnJxTiWJjzIyXVbvymL7xxpE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730647AbfGSEFu (ORCPT ); Fri, 19 Jul 2019 00:05:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:38394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731851AbfGSEFr (ORCPT ); Fri, 19 Jul 2019 00:05:47 -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 3C193218BA; Fri, 19 Jul 2019 04:05:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509146; bh=L3bfEAAL0Ysgipi+GDxrm8gZDpiTXGOXWVgDY9UE48k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B2uTbjfH0dtruYtPRP60D85ejVqqWmhd+z1+i7PoUwmSDvjW9rcUUijIuAhxszxBR X7CkdAC/rjk7Psa4T39hj1cGegHVsyxuThJNRJWQxLhdUkvwTPh6nE0bvDu+jGMnYV F35uhbMMSdXXNY6/n/PVFPzGbFXdN+9rGrYNWuDs= 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 5.1 096/141] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Fri, 19 Jul 2019 00:02:01 -0400 Message-Id: <20190719040246.15945-96-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719040246.15945-1-sashal@kernel.org> References: <20190719040246.15945-1-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 ba87e6e8d18c..0a4301a5155c 100644 --- a/tools/perf/tests/mmap-thread-lookup.c +++ b/tools/perf/tests/mmap-thread-lookup.c @@ -53,7 +53,7 @@ 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