1 files changed, 17 insertions, 7 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index af982f7cdb2a..9eb9eb928285 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -268,13 +268,14 @@ void prep_compound_page(struct page *page, unsigned long order)
 {
         int i;
         int nr_pages = 1 << order;
+        struct page *p = page + 1;
 
         set_compound_page_dtor(page, free_compound_page);
         set_compound_order(page, order);
         __SetPageHead(page);
-        for (i = 1; i < nr_pages; i++) {
-                struct page *p = page + i;
-
+        for (i = 1; i < nr_pages; i++, p++) {
+                if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0))
+                        p = pfn_to_page(page_to_pfn(page) + i);
                 __SetPageTail(p);
                 p->first_page = page;
         }
@@ -284,6 +285,7 @@ static void destroy_compound_page(struct page *page, unsigned long order)
 {
         int i;
         int nr_pages = 1 << order;
+        struct page *p = page + 1;
 
         if (unlikely(compound_order(page) != order))
                 bad_page(page);
@@ -291,8 +293,9 @@ static void destroy_compound_page(struct page *page, unsigned long order)
         if (unlikely(!PageHead(page)))
                         bad_page(page);
         __ClearPageHead(page);
-        for (i = 1; i < nr_pages; i++) {
-                struct page *p = page + i;
+        for (i = 1; i < nr_pages; i++, p++) {
+                if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0))
+                        p = pfn_to_page(page_to_pfn(page) + i);
 
                 if (unlikely(!PageTail(p) |
                                 (p->first_page != page)))
@@ -694,6 +697,9 @@ static int move_freepages(struct zone *zone,
 #endif
 
         for (page = start_page; page <= end_page;) {
+                /* Make sure we are not inadvertently changing nodes */
+                VM_BUG_ON(page_to_nid(page) != zone_to_nid(zone));
+
                 if (!pfn_valid_within(page_to_pfn(page))) {
                         page++;
                         continue;
@@ -2516,6 +2522,10 @@ static void setup_zone_migrate_reserve(struct zone *zone)
                         continue;
                 page = pfn_to_page(pfn);
 
+                /* Watch out for overlapping nodes */
+                if (page_to_nid(page) != zone_to_nid(zone))
+                        continue;
+
                 /* Blocks with reserved pages will never free, skip them. */
                 if (PageReserved(page))
                         continue;
@@ -3942,7 +3952,7 @@ static void check_for_regular_memory(pg_data_t *pgdat)
 void __init free_area_init_nodes(unsigned long *max_zone_pfn)
 {
         unsigned long nid;
-        enum zone_type i;
+        int i;
 
         /* Sort early_node_map as initialisation assumes it is sorted */
         sort_node_map();
@@ -4064,7 +4074,7 @@ void __init set_dma_reserve(unsigned long new_dma_reserve)
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-struct pglist_data contig_page_data = { .bdata = &bootmem_node_data[0] };
+struct pglist_data __refdata contig_page_data = { .bdata = &bootmem_node_data[0] };
 EXPORT_SYMBOL(contig_page_data);
 #endif