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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 3BC0CC43603 for ; Fri, 6 Dec 2019 14:21:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 15EAC20707 for ; Fri, 6 Dec 2019 14:21:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726256AbfLFOVL (ORCPT ); Fri, 6 Dec 2019 09:21:11 -0500 Received: from mx2.suse.de ([195.135.220.15]:56280 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726234AbfLFOVL (ORCPT ); Fri, 6 Dec 2019 09:21:11 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id F0671B042; Fri, 6 Dec 2019 14:21:09 +0000 (UTC) From: Daniel Wagner To: linux-rt-users@vger.kernel.org Cc: Daniel Wagner , Scott Wood , Sebastian Andrzej Siewior Subject: [PATCH] lib: Check for migrate_disable only on SMP systems Date: Fri, 6 Dec 2019 15:21:03 +0100 Message-Id: <20191206142103.29647-1-dwagner@suse.de> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org In case the kernel configuration is UP is, the migrate_disable member in task_struct is missing. linux/lib/smp_processor_id.c: In function ‘check_preemption_disabled’: linux/lib/smp_processor_id.c:26:13: error: ‘struct task_struct’ has no member named ‘migrate_disable’ 26 | if (current->migrate_disable) | ^~ Fixes: 425c5b38779a ("sched: Lazy migrate_disable processing") Cc: Scott Wood Cc: Sebastian Andrzej Siewior Signed-off-by: Daniel Wagner --- lib/smp_processor_id.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c index 5f2618d346c4..a914f73e3652 100644 --- a/lib/smp_processor_id.c +++ b/lib/smp_processor_id.c @@ -23,8 +23,10 @@ unsigned int check_preemption_disabled(const char *what1, const char *what2) * Kernel threads bound to a single CPU can safely use * smp_processor_id(): */ +#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE) if (current->migrate_disable) goto out; +#endif if (current->nr_cpus_allowed == 1) goto out; -- 2.24.0