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.

quoted

What would be better for 2.6.38 and 2.6.37-stable?  Moving that call

to

quoted

vunmap_page_range back under vb->lock, or the partial-Peter-patch

below?

quoted

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 :-)

Cheers,
Ben.