From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754749Ab2BQVVP (ORCPT ); Fri, 17 Feb 2012 16:21:15 -0500 Received: from mail-pw0-f46.google.com ([209.85.160.46]:62525 "EHLO mail-pw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751293Ab2BQVVO (ORCPT ); Fri, 17 Feb 2012 16:21:14 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of hughd@google.com designates 10.68.196.234 as permitted sender) smtp.mail=hughd@google.com; dkim=pass header.i=hughd@google.com Date: Fri, 17 Feb 2012 13:20:31 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: "Paul E. McKenney" cc: linux-kernel@vger.kernel.org Subject: [PATCH next] rcu: stop spurious warnings from synchronize_sched_expedited Message-ID: User-Agent: Alpine 2.00 (LSU 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org synchronize_sched_expedited() is spamming CONFIG_DEBUG_PREEMPT=y users with an unintended warning from the cpu_is_offline() check: use raw_smp_processor_id() instead of smp_processor_id() there. Signed-off-by: Hugh Dickins --- kernel/rcutree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- next/kernel/rcutree.c 2012-02-17 08:02:15.680065066 -0800 +++ linux/kernel/rcutree.c 2012-02-17 10:41:18.764003566 -0800 @@ -2014,7 +2014,7 @@ void synchronize_sched_expedited(void) /* Note that atomic_inc_return() implies full memory barrier. */ firstsnap = snap = atomic_inc_return(&sync_sched_expedited_started); get_online_cpus(); - WARN_ON_ONCE(cpu_is_offline(smp_processor_id())); + WARN_ON_ONCE(cpu_is_offline(raw_smp_processor_id())); /* * Each pass through the following loop attempts to force a