1 files changed, 15 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 092b2d8f2f0c..8dadda6e1feb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3584,6 +3584,21 @@ void *__init alloc_large_system_hash(const char *tablename,
 			for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++)
 				;
 			table = (void*) __get_free_pages(GFP_ATOMIC, order);
+			/*
+			 * If bucketsize is not a power-of-two, we may free
+			 * some pages at the end of hash table.
+			 */
+			if (table) {
+				unsigned long alloc_end = (unsigned long)table +
+						(PAGE_SIZE << order);
+				unsigned long used = (unsigned long)table +
+						PAGE_ALIGN(size);
+				split_page(virt_to_page(table), order);
+				while (used < alloc_end) {
+					free_page(used);
+					used += PAGE_SIZE;
+				}
+			}
 		}
 	} while (!table && size > PAGE_SIZE && --log2qty);