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=-18.8 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, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 A3C65C43331 for ; Fri, 5 Mar 2021 12:41:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 860DA65038 for ; Fri, 5 Mar 2021 12:41:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232022AbhCEMk4 (ORCPT ); Fri, 5 Mar 2021 07:40:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:55298 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231858AbhCEMkT (ORCPT ); Fri, 5 Mar 2021 07:40:19 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 62BBF6502A; Fri, 5 Mar 2021 12:40:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614948019; bh=drxMbElXbKylGnwkqnEgVdK7h30LmcEJRPvitXl20rQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jLxBj7kCkmbmrdBpVAUcpXljsgaaPlR/Usq08a4iVwGnst33Xnv2taWpYyDB/xzMh 3OLad35bKKCzLid+Rmp9Vj9XQiMb6ypU6vMrQqd768h/Z2IN14xR78C2ruj289W+np xkvpUm5QOkNB7TwTZW82XCHbh3mcE175gl9k99yc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Di Zhu , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.14 23/39] pktgen: fix misuse of BUG_ON() in pktgen_thread_worker() Date: Fri, 5 Mar 2021 13:22:22 +0100 Message-Id: <20210305120852.934850247@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210305120851.751937389@linuxfoundation.org> References: <20210305120851.751937389@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: linux-kernel@vger.kernel.org From: Di Zhu [ Upstream commit 275b1e88cabb34dbcbe99756b67e9939d34a99b6 ] pktgen create threads for all online cpus and bond these threads to relevant cpu repecivtily. when this thread firstly be woken up, it will compare cpu currently running with the cpu specified at the time of creation and if the two cpus are not equal, BUG_ON() will take effect causing panic on the system. Notice that these threads could be migrated to other cpus before start running because of the cpu hotplug after these threads have created. so the BUG_ON() used here seems unreasonable and we can replace it with WARN_ON() to just printf a warning other than panic the system. Signed-off-by: Di Zhu Link: https://lore.kernel.org/r/20210125124229.19334-1-zhudi21@huawei.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/core/pktgen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 884afb8e9fc4..b3132f11afeb 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -3555,7 +3555,7 @@ static int pktgen_thread_worker(void *arg) struct pktgen_dev *pkt_dev = NULL; int cpu = t->cpu; - BUG_ON(smp_processor_id() != cpu); + WARN_ON(smp_processor_id() != cpu); init_waitqueue_head(&t->queue); complete(&t->start_done); -- 2.30.1