Konstantin Belousov e5f0191f20 If the fast path unbusy in vm_page_replace() fails, slow path needs to
acquire the page lock, which recurses.  Avoid the recursion by reusing
the code from vm_page_remove() in a new helper
vm_page_xunbusy_maybelocked().

Reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
2016-06-01 20:39:00 +00:00
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