linux-kernel - Re: BUG on 3.0-rc on commit d72bce0e67e8afc6eb959f656013cbb577426f1e

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Message-ID: <1308018594.23688.36.camel@atheurer-ubuntu10>
Date:	Mon, 13 Jun 2011 21:29:54 -0500
From:	Andrew Theurer <habanero@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: BUG on 3.0-rc on commit
 d72bce0e67e8afc6eb959f656013cbb577426f1e

On Mon, 2011-06-13 at 21:24 -0400, Steven Rostedt wrote:
> On Mon, 2011-06-13 at 19:05 -0500, Andrew Theurer wrote:
> 
> > > Could you try this patch?
> > 
> > Yes, and it works!  Thanks very much!
> 
> Could you try this patch instead? I don't like holding off migration for
> the entire boot processes.

Sure, just tested this one, and it works fine as well.

-Andrew
> 
> -- Steve
> 
> diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
> index 88725c9..4505bfb 100644
> --- a/kernel/sched_rt.c
> +++ b/kernel/sched_rt.c
> @@ -1239,6 +1239,10 @@ static int find_lowest_rq(struct task_struct *task)
>  	int this_cpu = smp_processor_id();
>  	int cpu      = task_cpu(task);
> 
> +	/* Make sure the mask is initialized first */
> +	if (unlikely(!lowest_mask))
> +		return -1;
> +
>  	if (task->rt.nr_cpus_allowed == 1)
>  		return -1; /* No other targets possible */
> 
> 
> 


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