drm/radeon/kms: fix the regression of DVI connector check

[pandora-kernel.git] / mm / compaction.c

diff --git a/mm/compaction.c b/mm/compaction.c
index 899d956..8fb8a40 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -313,12 +313,34 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
                } else if (!locked)
                        spin_lock_irq(&zone->lru_lock);
 
+               /*
+                * migrate_pfn does not necessarily start aligned to a
+                * pageblock. Ensure that pfn_valid is called when moving
+                * into a new MAX_ORDER_NR_PAGES range in case of large
+                * memory holes within the zone
+                */
+               if ((low_pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) {
+                       if (!pfn_valid(low_pfn)) {
+                               low_pfn += MAX_ORDER_NR_PAGES - 1;
+                               continue;
+                       }
+               }
+
                if (!pfn_valid_within(low_pfn))
                        continue;
                nr_scanned++;
 
-               /* Get the page and skip if free */
+               /*
+                * Get the page and ensure the page is within the same zone.
+                * See the comment in isolate_freepages about overlapping
+                * nodes. It is deliberate that the new zone lock is not taken
+                * as memory compaction should not move pages between nodes.
+                */
                page = pfn_to_page(low_pfn);
+               if (page_zone(page) != zone)
+                       continue;
+
+               /* Skip if free */
                if (PageBuddy(page))
                        continue;