On Thu, 31 Jan 2008, Andrea Arcangeli wrote:
> On Wed, Jan 30, 2008 at 06:08:14PM -0800, Christoph Lameter wrote:
> > hlist_for_each_entry_safe_rcu(mn, n, t,
> ^^^^
>
> > &mm->mmu_notifier.head, hlist) {
> > hlist_del_rcu(&mn->hlist);
> ^^^^
>
> _rcu can go away from both, if hlist_del_rcu can be called w/o locks.
True. hlist_del_init ok? That would allow to check the driver that the
mmu_notifier is already linked in using !hlist_unhashed(). Driver then
needs to properly initialize the mmu_notifier list with INIT_HLIST_NODE().
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