On Fri, 05 Oct 2007 12:40:05 -0700
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

quoted text
> Well, isn't the correct fix to make Xen take all the pagetable locks
> while pinning/unpinning?  Adding exception handling to
> test_and_clear_bit would solve this particular race, but are there
> others (either now or potentially)?  Seems fragile.

You're right, holding the pagetable lock(s) across pinning/unpinning
operations would avoid the problem too.

While we do not care about the accessed bit, there are similar operations
going on with the dirty bit - which is a lot more important :)

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