On architectures with non-tree-based page tables like PowerPC, every page

in a range must be checked when calling pmap_remove(). Calling
pmap_remove() from vm_pageout_map_deactivate_pages() with the entire range
of the map could result in attempting to demap an extraordinary number
of pages (> 10^15), so iterate through each map entry and unmap each of
them individually.

MFC after:	6 weeks

1 files changed, 5 insertions, 2 deletions

diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index f4109c1..3d96d9e 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -701,8 +701,11 @@ vm_pageout_map_deactivate_pages(map, desired)
 	 * table pages.
 	 */
 	if (desired == 0 && nothingwired) {
-		pmap_remove(vm_map_pmap(map), vm_map_min(map),
-		    vm_map_max(map));
+		tmpe = map->header.next;
+		while (tmpe != &map->header) {
+			pmap_remove(vm_map_pmap(map), tmpe->start, tmpe->end);
+			tmpe = tmpe->next;
+		}
 	}
 	vm_map_unlock(map);
 }