[PATCH] sched: improve preempt debugging

[Ingo Molnar]

* Alexey Zaytsev <alexey.zaytsev@xxxxxxxxx> wrote:

> From: Alexey Zaytsev <alexey.zaytsev@xxxxxxxxx>
> Subject: [PATCH] Set the initial softirq preempt count to SOFTIRQ_OFFSET
> 
> Does not changes the preemption semantics, as the
> softirq's obviously can't be preempted, but fixes
> a spurious warning in sub_preempt_count, which
> happens when the preempt count is returned to
> zero, and the interrupted thread is holding the
> BKL.
> 
> Signed-off-by: Alexey Zaytsev <alexey.zaytsev@xxxxxxxxx>

applied to tip/sched/urgent, thanks Alexey.

I also re-added Nick's original patch on top of that (see it below) - this 
way we'll see whether it's all sorted out for good.

Thanks,

	Ingo

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