diff options
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/mm/internal.h b/mm/internal.h index 17256bb2f4ef..d20e3cc4aef0 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -8,23 +8,33 @@ * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ +#ifndef __MM_INTERNAL_H +#define __MM_INTERNAL_H -static inline void set_page_refs(struct page *page, int order) +#include <linux/mm.h> + +static inline void set_page_count(struct page *page, int v) +{ + atomic_set(&page->_count, v); +} + +/* + * Turn a non-refcounted page (->_count == 0) into refcounted with + * a count of one. + */ +static inline void set_page_refcounted(struct page *page) { -#ifdef CONFIG_MMU + BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page); + BUG_ON(atomic_read(&page->_count)); set_page_count(page, 1); -#else - int i; +} - /* - * We need to reference all the pages for this order, otherwise if - * anyone accesses one of the pages with (get/put) it will be freed. - * - eg: access_process_vm() - */ - for (i = 0; i < (1 << order); i++) - set_page_count(page + i, 1); -#endif /* CONFIG_MMU */ +static inline void __put_page(struct page *page) +{ + atomic_dec(&page->_count); } extern void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order); + +#endif |