svn commit: r288286 - stable/10/sys/vm

[Alan Cox]

Author: alc
Date: Sun Sep 27 01:26:41 2015
New Revision: 288286
URL: https://svnweb.freebsd.org/changeset/base/288286

Log:
  MFC r284654
    Avoid pmap_is_modified() on pages that can't be mapped.

Modified:
  stable/10/sys/vm/vm_pageout.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/vm/vm_pageout.c
==============================================================================
--- stable/10/sys/vm/vm_pageout.c	Sun Sep 27 01:20:55 2015	(r288285)
+++ stable/10/sys/vm/vm_pageout.c	Sun Sep 27 01:26:41 2015	(r288286)
@@ -1115,9 +1115,11 @@ vm_pageout_scan(struct vm_domain *vmd, i
 		 * then the page may still be modified until the last of those
 		 * mappings are removed.
 		 */
-		vm_page_test_dirty(m);
-		if (m->dirty == 0 && object->ref_count != 0)
-			pmap_remove_all(m);
+		if (object->ref_count != 0) {
+			vm_page_test_dirty(m);
+			if (m->dirty == 0)
+				pmap_remove_all(m);
+		}
 
 		if (m->valid == 0) {
 			/*