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    SubjectRe: [PATCH] mmu notifiers #v6
    On Wed, Feb 20, 2008 at 11:39:42AM +0100, Andrea Arcangeli wrote:
    > 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.


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