gpio: tpx65xxx: Include the right header

[linux-2.6-block.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c677c1506d73da040784c913a7035f725265e4b4..e75865d58ba70c42d2dd47e74fd27cb6484c1d6e 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8096,3 +8096,33 @@ bool is_free_buddy_page(struct page *page)
 
        return order < MAX_ORDER;
 }
+
+#ifdef CONFIG_MEMORY_FAILURE
+/*
+ * Set PG_hwpoison flag if a given page is confirmed to be a free page.  This
+ * test is performed under the zone lock to prevent a race against page
+ * allocation.
+ */
+bool set_hwpoison_free_buddy_page(struct page *page)
+{
+       struct zone *zone = page_zone(page);
+       unsigned long pfn = page_to_pfn(page);
+       unsigned long flags;
+       unsigned int order;
+       bool hwpoisoned = false;
+
+       spin_lock_irqsave(&zone->lock, flags);
+       for (order = 0; order < MAX_ORDER; order++) {
+               struct page *page_head = page - (pfn & ((1 << order) - 1));
+
+               if (PageBuddy(page_head) && page_order(page_head) >= order) {
+                       if (!TestSetPageHWPoison(page))
+                               hwpoisoned = true;
+                       break;
+               }
+       }
+       spin_unlock_irqrestore(&zone->lock, flags);
+
+       return hwpoisoned;
+}
+#endif