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.