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H A Dpmap-v4.cdiff 280324 Sat Mar 21 13:44:14 MDT 2015 cognet When waiting on PTE allocation, another thread could free the l2_dtable while
we're not looking at it.
Fix this by increasing l2->l2_occupancy before we try to alloc (and decrease
it if the allocation failed, or if another thread did a similar allocation).

Submitted by: Kohji Okuno <okuno.kohji@jp.panasonic.com>
MFC after: 1 week

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