linux-kernel - Re: [PATCH 3/5] coredump: cleanup the waiting for coredump

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Date:	Fri, 15 Feb 2013 15:30:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mandeep Singh Baines <msb@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	Tejun Heo <tj@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 3/5] coredump: cleanup the waiting for coredump_finish
 code

On Thu, 14 Feb 2013 15:38:14 -0800
Mandeep Singh Baines <msb@...omium.org> wrote:

> Replace the for loop with a simple if.

Well OK, but why?  Presumably the loop was added for a reason and
presumably you believe that reason to be (no longer?) correct.  Please
describe all these things.

> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -479,12 +479,9 @@ static void exit_mm(struct task_struct * tsk)
>  		if (atomic_dec_and_test(&core_state->nr_threads))
>  			complete(&core_state->startup);
>  
> -		for (;;) {
> -			set_task_state(tsk, TASK_UNINTERRUPTIBLE);
> -			if (!self.task) /* see coredump_finish() */
> -				break;
> +		set_task_state(tsk, TASK_UNINTERRUPTIBLE);
> +		if (self.task) /* see coredump_finish() */
>  			schedule();
> -		}


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