---

yaml --- r: 26878 b: refs/heads/master c: e984bb4 h: refs/heads/master v: v3
git-mirror · May 21, 2006 · f086c0d · f086c0d
1 parent c9f5c52
commit f086c0d
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Showing 3 changed files with 13 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ae57a856429dd932c547530df1b234eb7e642297
+refs/heads/master: e984bb43f7450312ba66fe0e67a99efa6be3b246
diff --git a/trunk/include/linux/mmzone.h b/trunk/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/trunk/mm/page_alloc.c b/trunk/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
 	/*