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=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 AD218C433FF for ; Mon, 29 Jul 2019 19:42:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8085A217D9 for ; Mon, 29 Jul 2019 19:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564429350; bh=+qdwOzhe7jaEDhHoYnSoTsCXmCW3kYF3aTRspMUM69g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QAWyHXVvElw5LSCXyMRMl7U1/6aD1pbVXC6aCxfFDl1H5BaVd4RqcOK7s86nhSjGW 6k1v76QF9fYNDaj0AA99nH0DReC/uN3wQv8+ELBrvsluN9lZxgLvGwF1ZyeICLzUy0 E7U6uxWYVnsCbxAzRKnti7N5/Zy2ncItwbW5Tmf4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389494AbfG2Tm3 (ORCPT ); Mon, 29 Jul 2019 15:42:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:58160 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388963AbfG2Tm0 (ORCPT ); Mon, 29 Jul 2019 15:42:26 -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 CF27B2054F; Mon, 29 Jul 2019 19:42:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564429345; bh=+qdwOzhe7jaEDhHoYnSoTsCXmCW3kYF3aTRspMUM69g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wXPqfZyZshV+A3eWZZLAH2wuHNiTOx8PP0J/l7zQE20VWGLDe4cbjljbO9svi+wuu LZdmWnd4C15mc1zotcGLOoapbB3PGWfrEz6lsuBDrvowJoj92rZmYXgSu9knUQDKoC VQR8lrNbSJ/yN4K2G1xHdkYpzpQrN9lHYTyHyCy4= 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 4.19 067/113] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Mon, 29 Jul 2019 21:22:34 +0200 Message-Id: <20190729190711.501308480@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190729190655.455345569@linuxfoundation.org> References: <20190729190655.455345569@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 b1af2499a3c9..7a9b123c7bfc 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