ath9k: Add a debugfs file to dump queue statistics

[cascardo/linux.git] / mm / page_isolation.c

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 345643b..f2f5b48 100644 (file)
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -200,10 +200,25 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn)
                        continue;
                }
                page = pfn_to_page(pfn);
-               if (PageBuddy(page))
+               if (PageBuddy(page)) {
+                       /*
+                        * If race between isolatation and allocation happens,
+                        * some free pages could be in MIGRATE_MOVABLE list
+                        * although pageblock's migratation type of the page
+                        * is MIGRATE_ISOLATE. Catch it and move the page into
+                        * MIGRATE_ISOLATE list.
+                        */
+                       if (get_freepage_migratetype(page) != MIGRATE_ISOLATE) {
+                               struct page *end_page;
+
+                               end_page = page + (1 << page_order(page)) - 1;
+                               move_freepages(page_zone(page), page, end_page,
+                                               MIGRATE_ISOLATE);
+                       }
                        pfn += 1 << page_order(page);
+               }
                else if (page_count(page) == 0 &&
-                               page_private(page) == MIGRATE_ISOLATE)
+                       get_freepage_migratetype(page) == MIGRATE_ISOLATE)
                        pfn += 1;
                else
                        break;
@@ -240,3 +255,14 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
        spin_unlock_irqrestore(&zone->lock, flags);
        return ret ? 0 : -EBUSY;
 }
+
+struct page *alloc_migrate_target(struct page *page, unsigned long private,
+                                 int **resultp)
+{
+       gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
+
+       if (PageHighMem(page))
+               gfp_mask |= __GFP_HIGHMEM;
+
+       return alloc_page(gfp_mask);
+}