linux-kernel - Re: [PATCH v3 4/6] sched/completion: Add wait_for_completion

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Date:   Fri, 26 Aug 2022 23:54:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mel Gorman <mgorman@...e.de>,
        Eric Biederman <ebiederm@...ssion.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>, Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 4/6] sched/completion: Add wait_for_completion_state()

On Tue, Aug 23, 2022 at 07:32:33PM +0200, Rafael J. Wysocki wrote:
> On Mon, Aug 22, 2022 at 1:48 PM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > Allows waiting with a custom @state.
> >
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > ---
> >  include/linux/completion.h |    1 +
> >  kernel/sched/completion.c  |    9 +++++++++
> >  2 files changed, 10 insertions(+)
> >
> > --- a/include/linux/completion.h
> > +++ b/include/linux/completion.h
> > @@ -103,6 +103,7 @@ extern void wait_for_completion(struct c
> >  extern void wait_for_completion_io(struct completion *);
> >  extern int wait_for_completion_interruptible(struct completion *x);
> >  extern int wait_for_completion_killable(struct completion *x);
> > +extern int wait_for_completion_state(struct completion *x, unsigned int state);
> >  extern unsigned long wait_for_completion_timeout(struct completion *x,
> >                                                    unsigned long timeout);
> >  extern unsigned long wait_for_completion_io_timeout(struct completion *x,
> > --- a/kernel/sched/completion.c
> > +++ b/kernel/sched/completion.c
> > @@ -247,6 +247,15 @@ int __sched wait_for_completion_killable
> >  }
> >  EXPORT_SYMBOL(wait_for_completion_killable);
> >
> > +int __sched wait_for_completion_state(struct completion *x, unsigned int state)
> > +{
> > +       long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, state);
> > +       if (t == -ERESTARTSYS)
> > +               return t;
> > +       return 0;
> > +}
> > +EXPORT_SYMBOL(wait_for_completion_state);
> 
> Why not EXPORT_SYMBOL_GPL?  I guess to match the above?

Yeah; I'm torn between preference and consistency here :-)