Move the vm_page_busy() in pmap_dispose_thread() to a place where it is covered by the page queues lock.  (This actually makes alpha's pmap_dispose_thread() look more like the i386's.)
Move the vm_page_busy() in pmap_dispose_thread() to a place where it is
covered by the page queues lock.  (This actually makes alpha's
pmap_dispose_thread() look more like the i386's.)

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