Re: PowerPC BUG: using smp_processor_id() in preemptible code

From: Benjamin Herrenschmidt
Date: Thu Feb 24 2011 - 16:23:48 EST

On Thu, 2011-02-24 at 22:07 +0100, Peter Zijlstra wrote:
> Lovely problem :-), benh mentioned it on IRC, but I never got around
> to
> finding the email thread, thanks for the CC.
> > What would be better for 2.6.38 and 2.6.37-stable? Moving that call
> to
> > vunmap_page_range back under vb->lock, or the partial-Peter-patch
> below?
> > And then what should be done for 2.6.39?
> I think you'll also need the arch/powerpc/kernel/process.c changes
> that
> cause context switches to flush the tlb_batch queues.

I don't think that's needed here as there shall be no batching happening
on the vmalloc space, but it can't hurt to merge it regardless :-)


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