svn commit: r253575 - user/attilio/vmobj-readlock/sys/vm

[Attilio Rao]

Author: attilio
Date: Tue Jul 23 15:59:13 2013
New Revision: 253575
URL: http://svnweb.freebsd.org/changeset/base/253575

Log:
  Save one atomic ops.
  
  Sponsored by:	EMC / Isilon storage division
  Tested by:	pho

Modified:
  user/attilio/vmobj-readlock/sys/vm/vm_glue.c

Modified: user/attilio/vmobj-readlock/sys/vm/vm_glue.c
==============================================================================
--- user/attilio/vmobj-readlock/sys/vm/vm_glue.c	Tue Jul 23 15:57:20 2013	(r253574)
+++ user/attilio/vmobj-readlock/sys/vm/vm_glue.c	Tue Jul 23 15:59:13 2013	(r253575)
@@ -256,8 +256,7 @@ vm_imgact_page_iostart(vm_object_t objec
 			goto out;
 		}
 	}
-	vm_page_busy_wunlock(m);
-	vm_page_busy_rlock(m);
+	vm_page_busy_downgrade(m);
 out:
 	VM_OBJECT_WUNLOCK(object);
 	return (m);