kib b22278d483 Microoptimize amd64/pmap.c pmap_protect_pde().
For the loop that dirties vm_pages in case superpage was written to,
check the complete condition before the loop.

Reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2017-02-19 03:33:20 +00:00
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