svn commit: r311513 - stable/11/sys/vm

[Konstantin Belousov]

Author: kib
Date: Fri Jan  6 11:46:24 2017
New Revision: 311513
URL: https://svnweb.freebsd.org/changeset/base/311513

Log:
  MFC r310834:
  Assert that the pages found on the object queue by vm_page_next() and
  vm_page_prev() have correct ownership.

Modified:
  stable/11/sys/vm/vm_page.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/vm/vm_page.c
==============================================================================
--- stable/11/sys/vm/vm_page.c	Fri Jan  6 10:18:34 2017	(r311512)
+++ stable/11/sys/vm/vm_page.c	Fri Jan  6 11:46:24 2017	(r311513)
@@ -1327,9 +1327,11 @@ vm_page_next(vm_page_t m)
 	vm_page_t next;
 
 	VM_OBJECT_ASSERT_LOCKED(m->object);
-	if ((next = TAILQ_NEXT(m, listq)) != NULL &&
-	    next->pindex != m->pindex + 1)
-		next = NULL;
+	if ((next = TAILQ_NEXT(m, listq)) != NULL) {
+		MPASS(next->object == m->object);
+		if (next->pindex != m->pindex + 1)
+			next = NULL;
+	}
 	return (next);
 }
 
@@ -1345,9 +1347,11 @@ vm_page_prev(vm_page_t m)
 	vm_page_t prev;
 
 	VM_OBJECT_ASSERT_LOCKED(m->object);
-	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
-	    prev->pindex != m->pindex - 1)
-		prev = NULL;
+	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL) {
+		MPASS(prev->object == m->object);
+		if (prev->pindex != m->pindex - 1)
+			prev = NULL;
+	}
 	return (prev);
 }