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-rw-r--r--include/linux/mmzone.h1
-rw-r--r--mm/page_alloc.c14
2 files changed, 12 insertions, 3 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index b5c21122c299..36740354d4db 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -22,6 +22,7 @@
#else
#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
#endif
+#define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1))
struct free_area {
struct list_head free_list;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bb3416932ab0..253a450c400d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2125,14 +2125,22 @@ static void __init alloc_node_mem_map(struct pglist_data *pgdat)
#ifdef CONFIG_FLAT_NODE_MEM_MAP
/* ia64 gets its own node_mem_map, before this, without bootmem */
if (!pgdat->node_mem_map) {
- unsigned long size;
+ unsigned long size, start, end;
struct page *map;
- size = (pgdat->node_spanned_pages + 1) * sizeof(struct page);
+ /*
+ * The zone's endpoints aren't required to be MAX_ORDER
+ * aligned but the node_mem_map endpoints must be in order
+ * for the buddy allocator to function correctly.
+ */
+ start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
+ end = pgdat->node_start_pfn + pgdat->node_spanned_pages;
+ end = ALIGN(end, MAX_ORDER_NR_PAGES);
+ size = (end - start) * sizeof(struct page);
map = alloc_remap(pgdat->node_id, size);
if (!map)
map = alloc_bootmem_node(pgdat, size);
- pgdat->node_mem_map = map;
+ pgdat->node_mem_map = map + (pgdat->node_start_pfn - start);
}
#ifdef CONFIG_FLATMEM
/*