linux-kernel - Re: [PATCH tip/core/rcu 05/10] workqueue: Eliminate cond_resched_rcu_qs() in favor of cond

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Message-Id: <20171204182835.GZ7829@linux.vnet.ibm.com>
Date:   Mon, 4 Dec 2017 10:28:35 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, dipankar@...ibm.com,
        akpm@...ux-foundation.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Triplett <josh@...htriplett.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Howells <dhowells@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        oleg@...hat.com, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH tip/core/rcu 05/10] workqueue: Eliminate
 cond_resched_rcu_qs() in favor of cond_resched()

On Sat, Dec 02, 2017 at 09:06:29AM +0800, Lai Jiangshan wrote:
> On Sat, Dec 2, 2017 at 3:21 AM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > Now that cond_resched() also provides RCU quiescent states when
> > needed, it can be used in place of cond_resched_rcu_qs().  This
> > commit therefore makes this change.
> >
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: Tejun Heo <tj@...nel.org>
> > Cc: Lai Jiangshan <jiangshanlai@...il.com>
> 
> Reviewed-by: Lai Jiangshan <jiangshanlai@...il.com>

Applied, thank you for the review!

							Thanx, Paul

> > ---
> >  kernel/workqueue.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> > index 8fdb710bfdd7..aee7eaab05cb 100644
> > --- a/kernel/workqueue.c
> > +++ b/kernel/workqueue.c
> > @@ -2135,7 +2135,7 @@ __acquires(&pool->lock)
> >          * stop_machine. At the same time, report a quiescent RCU state so
> >          * the same condition doesn't freeze RCU.
> >          */
> > -       cond_resched_rcu_qs();
> > +       cond_resched();
> >
> >         spin_lock_irq(&pool->lock);
> >
> > --
> > 2.5.2
> >
>