diff options
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index f6385fc17ad4..581703d86fbd 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -402,16 +402,23 @@ static inline void init_page_count(struct page *page) /* * PageBuddy() indicate that the page is free and in the buddy system * (see mm/page_alloc.c). + * + * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to + * -2 so that an underflow of the page_mapcount() won't be mistaken + * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very + * efficiently by most CPU architectures. */ +#define PAGE_BUDDY_MAPCOUNT_VALUE (-128) + static inline int PageBuddy(struct page *page) { - return atomic_read(&page->_mapcount) == -2; + return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE; } static inline void __SetPageBuddy(struct page *page) { VM_BUG_ON(atomic_read(&page->_mapcount) != -1); - atomic_set(&page->_mapcount, -2); + atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); } static inline void __ClearPageBuddy(struct page *page) @@ -965,6 +972,10 @@ static inline int handle_mm_fault(struct mm_struct *mm, extern int make_pages_present(unsigned long addr, unsigned long end); extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); +int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, int len, unsigned int foll_flags, + struct page **pages, struct vm_area_struct **vmas, + int *nonblocking); int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int nr_pages, int write, int force, struct page **pages, struct vm_area_struct **vmas); @@ -1309,8 +1320,6 @@ int add_from_early_node_map(struct range *range, int az, int nr_range, int nid); u64 __init find_memory_core_early(int nid, u64 size, u64 align, u64 goal, u64 limit); -void *__alloc_memory_core_early(int nodeid, u64 size, u64 align, - u64 goal, u64 limit); typedef int (*work_fn_t)(unsigned long, unsigned long, void *); extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); extern void sparse_memory_present_with_active_regions(int nid); @@ -1530,6 +1539,7 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address, #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ #define FOLL_MLOCK 0x40 /* mark page as mlocked */ #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ +#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, void *data); @@ -1622,14 +1632,6 @@ extern int sysctl_memory_failure_recovery; extern void shake_page(struct page *p, int access); extern atomic_long_t mce_bad_pages; extern int soft_offline_page(struct page *page, int flags); -#ifdef CONFIG_MEMORY_FAILURE -int is_hwpoison_address(unsigned long addr); -#else -static inline int is_hwpoison_address(unsigned long addr) -{ - return 0; -} -#endif extern void dump_page(struct page *page); |