[ofa-general] Re: [PATCH 01 of 12] Core of mmu notifiers

[Andrea Arcangeli]

On Tue, Apr 22, 2008 at 06:07:27PM -0500, Robin Holt wrote:
> > The only other change I did has been to move mmu_notifier_unregister
> > at the end of the patchset after getting more questions about its
> > reliability and I documented a bit the rmmod requirements for
> > ->release. we'll think later if it makes sense to add it, nobody's
> > using it anyway.
> 
> XPMEM is using it.  GRU will be as well (probably already does).

XPMEM requires more patches anyway. Note that in previous email you
told me you weren't using it. I think GRU can work fine on 2.6.26
without mmu_notifier_unregister, like KVM too. You've simply to unpin
the module count in ->release. The most important bit is that you've
to do that anyway in case mmu_notifier_unregister fails (and it can
fail because of vmalloc space shortage because somebody loaded some
framebuffer driver or whatever).