On Wed, May 07, 2014 at 05:13:32PM -0700, Michel Lespinasse wrote:
> On Tue, May 6, 2014 at 6:06 AM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
> > Fixes: 108d6642ad81 ("mm anon rmap: remove anon_vma_moveto_tail")
>
> I think 108d6642ad81 on its own was OK (as it always took the locks);
> but the attempt to not take them in the common case in 38a76013ad80 is
> where I forgot to consider the THP case.
108d6642ad81 replaced the chain ordering with an explicit lock, but I
see the unconditional locking only in move_ptes(), which isn't called
for THP pmds.
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