Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752327AbaLDAaj (ORCPT ); Wed, 3 Dec 2014 19:30:39 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57667 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751322AbaLDAai (ORCPT ); Wed, 3 Dec 2014 19:30:38 -0500 Date: Wed, 3 Dec 2014 19:30:24 -0500 From: Dave Jones To: Andy Lutomirski Cc: Frederic Weisbecker , Linux Kernel , Richard Guy Briggs , Eric Paris , Linus Torvalds , Oleg Nesterov , Paul McKenney Subject: Re: [PATCH] context_tracking: Restore previous state in schedule_user Message-ID: <20141204003024.GA17665@redhat.com> Mail-Followup-To: Dave Jones , Andy Lutomirski , Frederic Weisbecker , Linux Kernel , Richard Guy Briggs , Eric Paris , Linus Torvalds , Oleg Nesterov , Paul McKenney References: <20141203220836.GC31369@lerouge> <20141203235835.GE31369@lerouge> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 03, 2014 at 04:04:31PM -0800, Andy Lutomirski wrote: > On Wed, Dec 3, 2014 at 3:58 PM, Frederic Weisbecker wrote: > > On Wed, Dec 03, 2014 at 03:18:41PM -0800, Andy Lutomirski wrote: > >> It appears that some SCHEDULE_USER (asm for schedule_user) callers > >> in arch/x86/kernel/entry_64.S are called from RCU kernel context, > >> and schedule_user will return in RCU user context. This causes RCU > >> warnings and possible failures. > >> > >> This is intended to be a minimal fix suitable for 3.18. > >> > >> Reported-by: Dave Jones > >> Cc: Oleg Nesterov > >> Cc: Fr?d?ric Weisbecker > >> Cc: Paul McKenney > >> Signed-off-by: Andy Lutomirski > > > > Ah, we sent it about at the same time :-) > > > > Might be too late for 3.18 though because it's not a regression. Wait, so how come that trace didn't start showing up until recently ? Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/