linux-kernel - Re: [PATCH 1/2] semaphore: give an unlikely for down's timeout

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Date:	Fri, 1 Mar 2013 14:09:08 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	liguang <lig.fnst@...fujitsu.com>
Cc:	luciarosculete@...il.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] semaphore: give an unlikely for down's timeout

On Fri, 1 Mar 2013, liguang wrote:

> Signed-off-by: liguang <lig.fnst@...fujitsu.com>

Acked-by: Jiri Kosina <jkosina@...e.cz>


Makes sense. Adding Andrew to CC.

> ---
>  kernel/semaphore.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/semaphore.c b/kernel/semaphore.c
> index 4567fc0..9c7017d 100644
> --- a/kernel/semaphore.c
> +++ b/kernel/semaphore.c
> @@ -214,7 +214,7 @@ static inline int __sched __down_common(struct semaphore *sem, long state,
>  	for (;;) {
>  		if (signal_pending_state(state, task))
>  			goto interrupted;
> -		if (timeout <= 0)
> +		if (unlikely(timeout <= 0))
>  			goto timed_out;
>  		__set_task_state(task, state);
>  		raw_spin_unlock_irq(&sem->lock);
> -- 
> 1.7.2.5
> 

-- 
Jiri Kosina
SUSE Labs
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