From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752762Ab1HYFFC (ORCPT ); Thu, 25 Aug 2011 01:05:02 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:47264 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751789Ab1HYFE7 (ORCPT ); Thu, 25 Aug 2011 01:04:59 -0400 Date: Wed, 24 Aug 2011 22:04:56 -0700 From: "Paul E. McKenney" To: Arnaud Lacombe Cc: Stephen Rothwell , linux-next@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: linux-next: build warning after merge of the rcu tree Message-ID: <20110825050456.GB2411@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110824142337.78715e4d6f9db2de68d87fe4@canb.auug.org.au> <20110824122739.GB2320@linux.vnet.ibm.com> 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/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 24, 2011 at 08:46:15PM -0400, Arnaud Lacombe wrote: > Hi, > > On Wed, Aug 24, 2011 at 8:27 AM, Paul E. McKenney > wrote: > > On Wed, Aug 24, 2011 at 02:23:37PM +1000, Stephen Rothwell wrote: > >> Hi Paul, > >> > >> After merging the rcu tree, today's linux-next build (powerpc > >> ppc64_defconfig) produced this warning: > >> > >> kernel/rtmutex.c: In function '__rt_mutex_slowlock': > >> kernel/rtmutex.c:605:3: warning: suggest parentheses around assignment used as truth value > > > > There actually already are parentheses around it, and the first pass > > through the loop it is uninitialized at that point.  But hey, that > > is gcc for you!  Does the patch below cure it? > > > Yes. Thank you! Thanx, Paul > - Arnaud > > >> Introduced by commit 83841f021d4b ("rcu: Permit rt_mutex_unlock() with > >> irqs disabled"). > > > > If it does, then I will fold into that commit. > > > >                                                        Thanx, Paul > > > > ------------------------------------------------------------------------ > > > > Signed-off-by: Paul E. McKenney > > > > diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c > > index 0222e34..2548f44 100644 > > --- a/kernel/rtmutex.c > > +++ b/kernel/rtmutex.c > > @@ -602,7 +602,8 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state, > > > >                raw_spin_unlock(&lock->wait_lock); > > > > -               if (was_disabled = irqs_disabled()) > > +               was_disabled = irqs_disabled(); > > +               if (was_disabled) > >                        local_irq_enable(); > > > >                debug_rt_mutex_print_deadlock(waiter); > > -- > > 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/ > >