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/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Cc: Arjun Roy <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Punit Agrawal <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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