diff options
| -rw-r--r-- | mm/page_alloc.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fe55c14bd4dc..9e1885109665 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -179,20 +179,20 @@ static void destroy_compound_page(struct page *page, unsigned long order) */ static inline void __free_pages_bulk (struct page *page, struct page *base, - struct zone *zone, struct free_area *area, unsigned long mask, - unsigned int order) + struct zone *zone, struct free_area *area, unsigned int order) { - unsigned long page_idx, index; + unsigned long page_idx, index, mask; if (order) destroy_compound_page(page, order); + mask = (~0UL) << order; page_idx = page - base; if (page_idx & ~mask) BUG(); index = page_idx >> (1 + order); - zone->free_pages -= mask; - while (mask + (1 << (MAX_ORDER-1))) { + zone->free_pages += 1 << order; + while (order < MAX_ORDER-1) { struct page *buddy1, *buddy2; BUG_ON(area >= zone->free_area + MAX_ORDER); @@ -201,17 +201,15 @@ static inline void __free_pages_bulk (struct page *page, struct page *base, * the buddy page is still allocated. */ break; - /* - * Move the buddy up one level. - * This code is taking advantage of the identity: - * -mask = 1+~mask - */ - buddy1 = base + (page_idx ^ -mask); + + /* Move the buddy up one level. */ + buddy1 = base + (page_idx ^ (1 << order)); buddy2 = base + page_idx; BUG_ON(bad_range(zone, buddy1)); BUG_ON(bad_range(zone, buddy2)); list_del(&buddy1->lru); mask <<= 1; + order++; area++; index >>= 1; page_idx &= mask; @@ -255,12 +253,11 @@ static int free_pages_bulk(struct zone *zone, int count, struct list_head *list, unsigned int order) { - unsigned long mask, flags; + unsigned long flags; struct free_area *area; struct page *base, *page = NULL; int ret = 0; - mask = (~0UL) << order; base = zone->zone_mem_map; area = zone->free_area + order; spin_lock_irqsave(&zone->lock, flags); @@ -270,7 +267,7 @@ free_pages_bulk(struct zone *zone, int count, page = list_entry(list->prev, struct page, lru); /* have to delete it as __free_pages_bulk list manipulates */ list_del(&page->lru); - __free_pages_bulk(page, base, zone, area, mask, order); + __free_pages_bulk(page, base, zone, area, order); ret++; } spin_unlock_irqrestore(&zone->lock, flags); |