current->sched_class->yield_task is NULL, any hint?

[Lin Ming]

On Wed, Apr 9, 2014 at 11:25 AM, Peter Zijlstra <peterz at infradead.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.