linux-kernel - Re: current->sched_class->yield

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Message-ID: <CAF1ivSYeQcGf2d9kB-0R0TmCy=zaFg4WeJ2mgG_=K41hsoizyA@mail.gmail.com>
Date:	Wed, 9 Apr 2014 11:32:20 -0700
From:	Lin Ming <minggr@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: current->sched_class->yield_task is NULL, any hint?

On Wed, Apr 9, 2014 at 11:25 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Apr 09, 2014 at 10:43:32AM -0700, Lin Ming wrote:
>> Hi Peter,
>>
>> I hit a panic in sys_sched_yield() because(for some unknown reason)
>> current->sched_class->yield_task is NULL.
>> It's an ARM embedded board with 3.4-rt kernel.
>>
>> Could you share any hint for the possible causes?
>
> What class does current->sched_class point to?

[12890.088232] Process swapper/0 (pid: 0, stack limit = 0xc07042f0)

It's idle task. I think it should be idle_sched_class.
But let me double check it.

Thanks.
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