linux-kernel - Re: [PATCH 1/2] stop_machine: check work->done while handling enqueued works

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Date:	Fri, 08 Feb 2013 17:21:27 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] stop_machine: check work->done while handling enqueued works

Hi Hillf,

On Fri, 8 Feb 2013 11:39:56 +0800, Hillf Danton wrote:
> The comment just above cpu_stop_signal_done() says it is uncertain that
> the input @done is valid, and the works enqueued through the function
> stop_one_cpu_nowait() do carry no done, thus we have to check if it is
> valid when updating work result.

The only user of stop_one_cpu_nowait() is the scheduler active balancer
and active_load_balance_cpu_stop() always returns 0.  But I think this
change makes its sense and the code evolves, so:

Reviewed-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

>
> Signed-off-by: Hillf Danton <dhillf@...il.com>
> ---
>
> --- a/kernel/stop_machine.c	Thu Feb  7 20:03:10 2013
> +++ b/kernel/stop_machine.c	Fri Feb  8 11:07:40 2013
> @@ -279,7 +279,7 @@ repeat:
>  		preempt_disable();
>
>  		ret = fn(arg);
> -		if (ret)
> +		if (ret && done != NULL)
>  			done->ret = ret;
>
>  		/* restore preemption and check it's still balanced */
> --
--
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