linux-kernel - Re: [PATCH 2/2] task_work: check callback if it's NULL

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Date:	Thu, 14 Mar 2013 15:43:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	liguang <lig.fnst@...fujitsu.com>
Cc:	viro@...iv.linux.org.uk, edumazet@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] task_work: check callback if it's NULL

On 03/14, liguang wrote:
>
> Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> ---
>  kernel/task_work.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/task_work.c b/kernel/task_work.c
> index 0bf4258..f458b08 100644
> --- a/kernel/task_work.c
> +++ b/kernel/task_work.c
> @@ -75,7 +75,8 @@ void task_work_run(void)
>
>  		do {
>  			next = work->next;
> -			work->func(work);
> +			if (unlikely(work->func))
> +				work->func(work);

Why?

Oleg.

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