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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 7C7E7C636CA for ; Thu, 15 Jul 2021 18:45:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67313613D9 for ; Thu, 15 Jul 2021 18:45:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239017AbhGOSsS (ORCPT ); Thu, 15 Jul 2021 14:48:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:50098 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238897AbhGOSry (ORCPT ); Thu, 15 Jul 2021 14:47:54 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 33580613D2; Thu, 15 Jul 2021 18:45:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626374700; bh=LSLT1XLobsp7Ag5hdiSVQhRhRsAB9zdQBrJKly2LBAQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=deZ5GcDLzs7uoRclh3keBWGuG3sPcv541wqKROYvNInzF6hliLZ2x6V+d/xjKmRtM Bz5/QLPMsE1CG6o4JuCeVr0R6e3lH9FehN138oTiS57PdQ1QdiM9bq/ZxlOHu2KvdJ rm5651kmkfwuLM70ACrfnh9XWRCV1F2cpyH4m2Y4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Rogers , Jiri Olsa , Alexander Shishkin , Mark Rutland , Namhyung Kim , Peter Zijlstra , Stephane Eranian , Arnaldo Carvalho de Melo , Anders Roxell Subject: [PATCH 5.4 074/122] perf bench: Fix 2 memory sanitizer warnings Date: Thu, 15 Jul 2021 20:38:41 +0200 Message-Id: <20210715182509.449639236@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210715182448.393443551@linuxfoundation.org> References: <20210715182448.393443551@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ian Rogers commit d2c73501a767514b6c85c7feff9457a165d51057 upstream. Memory sanitizer warns if a write is performed where the memory being read for the write is uninitialized. Avoid this warning by initializing the memory. Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lore.kernel.org/lkml/20200912053725.1405857-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo Cc: Anders Roxell Signed-off-by: Greg Kroah-Hartman --- tools/perf/bench/sched-messaging.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/tools/perf/bench/sched-messaging.c +++ b/tools/perf/bench/sched-messaging.c @@ -66,11 +66,10 @@ static void fdpair(int fds[2]) /* Block until we're ready to go */ static void ready(int ready_out, int wakefd) { - char dummy; struct pollfd pollfd = { .fd = wakefd, .events = POLLIN }; /* Tell them we're ready. */ - if (write(ready_out, &dummy, 1) != 1) + if (write(ready_out, "R", 1) != 1) err(EXIT_FAILURE, "CLIENT: ready write"); /* Wait for "GO" signal */ @@ -85,6 +84,7 @@ static void *sender(struct sender_contex unsigned int i, j; ready(ctx->ready_out, ctx->wakefd); + memset(data, 'S', sizeof(data)); /* Now pump to every receiver. */ for (i = 0; i < nr_loops; i++) {