diff options
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 102 |
1 files changed, 11 insertions, 91 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 47a93928b90f..0755b9fd03a7 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -251,6 +251,9 @@ struct vm_operations_struct { * writable, if an error is returned it will cause a SIGBUS */ int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); + /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ + int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); + /* called by access_process_vm when get_user_pages() fails, typically * for use by special VMAs that can switch between memory and hardware */ @@ -494,15 +497,6 @@ static inline int page_count(struct page *page) return atomic_read(&compound_head(page)->_count); } -#ifdef CONFIG_HUGETLB_PAGE -extern int PageHeadHuge(struct page *page_head); -#else /* CONFIG_HUGETLB_PAGE */ -static inline int PageHeadHuge(struct page *page_head) -{ - return 0; -} -#endif /* CONFIG_HUGETLB_PAGE */ - static inline bool __compound_tail_refcounted(struct page *page) { return !PageSlab(page) && !PageHeadHuge(page); @@ -571,53 +565,6 @@ static inline void init_page_count(struct page *page) atomic_set(&page->_count, 1); } -/* - * 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) == PAGE_BUDDY_MAPCOUNT_VALUE; -} - -static inline void __SetPageBuddy(struct page *page) -{ - VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); - atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); -} - -static inline void __ClearPageBuddy(struct page *page) -{ - VM_BUG_ON_PAGE(!PageBuddy(page), page); - atomic_set(&page->_mapcount, -1); -} - -#define PAGE_BALLOON_MAPCOUNT_VALUE (-256) - -static inline int PageBalloon(struct page *page) -{ - return atomic_read(&page->_mapcount) == PAGE_BALLOON_MAPCOUNT_VALUE; -} - -static inline void __SetPageBalloon(struct page *page) -{ - VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); - atomic_set(&page->_mapcount, PAGE_BALLOON_MAPCOUNT_VALUE); -} - -static inline void __ClearPageBalloon(struct page *page) -{ - VM_BUG_ON_PAGE(!PageBalloon(page), page); - atomic_set(&page->_mapcount, -1); -} - void put_page(struct page *page); void put_pages_list(struct list_head *pages); @@ -1006,34 +953,10 @@ void page_address_init(void); #define page_address_init() do { } while(0) #endif -/* - * On an anonymous page mapped into a user virtual memory area, - * page->mapping points to its anon_vma, not to a struct address_space; - * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. - * - * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, - * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; - * and then page->mapping points, not to an anon_vma, but to a private - * structure which KSM associates with that merged page. See ksm.h. - * - * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. - * - * Please note that, confusingly, "page_mapping" refers to the inode - * address_space which maps the page from disk; whereas "page_mapped" - * refers to user virtual address space into which the page is mapped. - */ -#define PAGE_MAPPING_ANON 1 -#define PAGE_MAPPING_KSM 2 -#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) - +extern void *page_rmapping(struct page *page); +extern struct anon_vma *page_anon_vma(struct page *page); extern struct address_space *page_mapping(struct page *page); -/* Neutral page->mapping pointer to address_space or anon_vma or other */ -static inline void *page_rmapping(struct page *page) -{ - return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); -} - extern struct address_space *__page_file_mapping(struct page *); static inline @@ -1045,11 +968,6 @@ struct address_space *page_file_mapping(struct page *page) return page->mapping; } -static inline int PageAnon(struct page *page) -{ - return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; -} - /* * Return the pagecache index of the passed page. Regular pagecache pages * use ->index whereas swapcache pages use ->private @@ -1294,9 +1212,11 @@ int __set_page_dirty_no_writeback(struct page *page); int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page); void account_page_dirtied(struct page *page, struct address_space *mapping); +void account_page_cleaned(struct page *page, struct address_space *mapping); int set_page_dirty(struct page *page); int set_page_dirty_lock(struct page *page); int clear_page_dirty_for_io(struct page *page); + int get_cmdline(struct task_struct *task, char *buffer, int buflen); /* Is the vma a continuation of the stack vma above it? */ @@ -1973,10 +1893,10 @@ extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); static inline unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) { - if (!(info->flags & VM_UNMAPPED_AREA_TOPDOWN)) - return unmapped_area(info); - else + if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) return unmapped_area_topdown(info); + else + return unmapped_area(info); } /* truncate.c */ @@ -2109,7 +2029,7 @@ static inline struct page *follow_page(struct vm_area_struct *vma, #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO * and return without waiting upon it */ -#define FOLL_MLOCK 0x40 /* mark page as mlocked */ +#define FOLL_POPULATE 0x40 /* fault in page */ #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |