 o Lock page queue accesses by vm_page_activate() and vm_page_deactivate()    in vm_pageout_object_deactivate_pages().  o Apply some style fixes to vm_pageout_object_deactivate_pages().
 o Lock page queue accesses by vm_page_activate() and vm_page_deactivate()
   in vm_pageout_object_deactivate_pages().
 o Apply some style fixes to vm_pageout_object_deactivate_pages().

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