vsense: use shorter data transfers

[pandora-kernel.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3cf3d05..27b8681 100644 (file)
--- 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;
@@ -3753,23 +3763,6 @@ unsigned long __init find_min_pfn_with_active_regions(void)
        return find_min_pfn_for_node(MAX_NUMNODES);
 }
 
-/**
- * find_max_pfn_with_active_regions - Find the maximum PFN registered
- *
- * It returns the maximum PFN based on information provided via
- * add_active_range().
- */
-unsigned long __init find_max_pfn_with_active_regions(void)
-{
-       int i;
-       unsigned long max_pfn = 0;
-
-       for (i = 0; i < nr_nodemap_entries; i++)
-               max_pfn = max(max_pfn, early_node_map[i].end_pfn);
-
-       return max_pfn;
-}
-
 /*
  * early_calculate_totalpages()
  * Sum pages in active regions for movable zone.
@@ -4081,7 +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
 
@@ -4454,7 +4447,7 @@ void *__init alloc_large_system_hash(const char *tablename,
        do {
                size = bucketsize << log2qty;
                if (flags & HASH_EARLY)
-                       table = alloc_bootmem(size);
+                       table = alloc_bootmem_nopanic(size);
                else if (hashdist)
                        table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
                else {