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

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Date:   Sun, 4 Sep 2022 12:46:11 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     rjw@...ysocki.net, oleg@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de,
        ebiederm@...ssion.com, bigeasy@...utronix.de,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        tj@...nel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 4/6] sched/completion: Add wait_for_completion_state()


* 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;

Nit: newline missing after local variable definition.

Other than that:

Reviewed-by: Ingo Molnar <mingo@...nel.org>


Thanks,

	Ingo