linux-kernel - Re: BUG: using smp_processor_id() in preemptible code: s2disk

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Date:	Mon, 14 Jun 2010 16:23:31 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: BUG: using smp_processor_id() in preemptible code: s2disk

On Monday, June 14, 2010, Sergey Senozhatsky wrote:
> Hello,
> Not sure if this simple solution is the correct one.

Well, let's ask the scheduler people.

Ingo, Peter, what do you think of the patch below?

Rafael


> ---
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index f8b8996..cfb262b 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2866,7 +2866,10 @@ unsigned long nr_iowait(void)
>  
>  unsigned long nr_iowait_cpu(void)
>  {
> -	struct rq *this = this_rq();
> +	int cpu = get_cpu();
> +	struct rq *this = cpu_rq(cpu);
> +	put_cpu();
> +	
>  	return atomic_read(&this->nr_iowait);
>  }
>  
--
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