On Wed, Feb 20, 2008 at 11:39:42AM +0100, Andrea Arcangeli wrote:
quoted text
> XPMEM simply can't use RCU for the registration locking if it wants to
> schedule inside the mmu notifier calls. So I guess it's better to add

Whoa there.  In Christoph's patch, we did not use rcu for the list.  It
was a simple hlist_head.  The list manipulations were done under
down_write(&current->mm->mmap_sem) and would therefore not be racy.  All
the callout locations are already acquiring the mmap_sem at least
readably, so we should be safe.  Maybe I missed a race somewhere.

Thanks,
Robin
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