linux-kernel - Re: linux-next: build warning after merge of the rcu tree

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Date:	Wed, 24 Aug 2011 22:04:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build warning after merge of the rcu tree

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
> <paulmck@...ux.vnet.ibm.com> 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 <paulmck@...ux.vnet.ibm.com>
> >
> > 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);
> > --
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