mm: handle some PMD faults under the VMA lock

Push the VMA_LOCK check down from __handle_mm_fault() to
handle_pte_fault().  Once again, we refuse to call ->huge_fault() with the
VMA lock held, but we will wait for a PMD migration entry with the VMA
lock held, handle NUMA migration and set the accessed bit.  We were
already doing this for anonymous VMAs, so it should be safe.

Link: https://lkml.kernel.org/r/20230724185410.1124082-6-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>