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 2474BC73C46 for ; Tue, 9 Jul 2019 18:31:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04D5B216C4 for ; Tue, 9 Jul 2019 18:31:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562697105; bh=H1lXyVSrJdlhwUe6Wi6nEcC6iJYeflbVrs5S8NzVf6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WoCsYCDnH3o/bCGd2NnkRfzqk6EtXDpgOCvit/JlXoeO6+AP9mEDStSVTMV1J8MhW JKYV7m8N75G/8Z15gPNgtvLcLZxfLSA57Oq0BBvbKGXzqZ6Ldbrch73dVwXiwb0JYG juFJaMzXV9FBB8OsNz7HKne2SuS/wmz9Pg1EL51c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729022AbfGISbo (ORCPT ); Tue, 9 Jul 2019 14:31:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:52830 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728991AbfGISbm (ORCPT ); Tue, 9 Jul 2019 14:31:42 -0400 Received: from quaco.ghostprotocols.net (unknown [179.97.35.11]) (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 76D9621537; Tue, 9 Jul 2019 18:31:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562697101; bh=H1lXyVSrJdlhwUe6Wi6nEcC6iJYeflbVrs5S8NzVf6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IYHeEhDVFRs2Nc1Mjt1rT8J/gRuLTqT+ug6vDRKCjWPyDqtTEaWlo/jyQc6h/076N Rgfxd1DgkKR9FD2XmzO4Qs64TEB6EErESzBbHb5KXeUXllCyDu2i5irh4Yk4k7tPXk N52GX2j2ubk5bNkna30/8PZiyQCalOwvFAnCImJc= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Numfor Mbiziwo-Tiapo , Alexander Shishkin , Ian Rogers , Jiri Olsa , Mark Drayton , Peter Zijlstra , Song Liu , Stephane Eranian , Arnaldo Carvalho de Melo Subject: [PATCH 01/25] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Date: Tue, 9 Jul 2019 15:31:02 -0300 Message-Id: <20190709183126.30257-2-acme@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190709183126.30257-1-acme@kernel.org> References: <20190709183126.30257-1-acme@kernel.org> MIME-Version: 1.0 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 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 --- 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; -- 2.21.0