nwhitehorn d394621163 Avoid a lock order reversal in pmap_extract_and_hold() from relocking
the page. This PMAP requires an additional lock besides the PMAP lock
in pmap_extract_and_hold(), which vm_page_pa_tryrelock() did not release.

Suggested by:	kib
MFC after:	4 days
2012-04-22 17:58:30 +00:00
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