1 files changed, 9 insertions, 91 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6571dd78e984..8b086070c3a5 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
          */
@@ -494,18 +497,9 @@ 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);
+        return PageAnon(page) && !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
@@ -1975,10 +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 */