1 files changed, 5 insertions, 22 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0986d19be0b7..6a75a7a78bf1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -144,7 +144,8 @@ extern unsigned int kobjsize(const void *objp);
 
 #define VM_GROWSDOWN    0x00000100      /* general info on the segment */
 #define VM_GROWSUP      0x00000200
-#define VM_SHM          0x00000400      /* shared memory area, don't swap out */
+#define VM_SHM          0x00000000      /* Means nothing: delete it later */
+#define VM_PFNMAP       0x00000400      /* Page-ranges managed without "struct page", just pure PFN */
 #define VM_DENYWRITE    0x00000800      /* ETXTBSY on write attempts.. */
 
 #define VM_EXECUTABLE   0x00001000
@@ -157,7 +158,7 @@ extern unsigned int kobjsize(const void *objp);
 
 #define VM_DONTCOPY     0x00020000      /* Do not copy this vma on fork */
 #define VM_DONTEXPAND   0x00040000      /* Cannot expand with mremap() */
-#define VM_RESERVED     0x00080000      /* Pages managed in a special way */
+#define VM_RESERVED     0x00080000      /* Count as reserved_vm like IO */
 #define VM_ACCOUNT      0x00100000      /* Is a VM accounted object */
 #define VM_HUGETLB      0x00400000      /* Huge TLB Page VM */
 #define VM_NONLINEAR    0x00800000      /* Is non-linear (remap_file_pages) */
@@ -311,8 +312,6 @@ struct page {
 
 extern void FASTCALL(__page_cache_release(struct page *));
 
-#ifdef CONFIG_HUGETLB_PAGE
-
 static inline int page_count(struct page *page)
 {
         if (PageCompound(page))
@@ -329,23 +328,6 @@ static inline void get_page(struct page *page)
 
 void put_page(struct page *page);
 
-#else           /* CONFIG_HUGETLB_PAGE */
-
-#define page_count(p)           (atomic_read(&(p)->_count) + 1)
-
-static inline void get_page(struct page *page)
-{
-        atomic_inc(&page->_count);
-}
-
-static inline void put_page(struct page *page)
-{
-        if (put_page_testzero(page))
-                __page_cache_release(page);
-}
-
-#endif          /* CONFIG_HUGETLB_PAGE */
-
 /*
  * Multiple processes may "see" the same page. E.g. for untouched
  * mappings of /dev/null, all processes see the same page full of
@@ -682,6 +664,7 @@ struct zap_details {
         unsigned long truncate_count;           /* Compare vm_truncate_count */
 };
 
+struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t);
 unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
                 unsigned long size, struct zap_details *);
 unsigned long unmap_vmas(struct mmu_gather **tlb,
@@ -971,7 +954,7 @@ unsigned long vmalloc_to_pfn(void *addr);
 int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
                         unsigned long pfn, unsigned long size, pgprot_t);
 
-struct page *follow_page(struct mm_struct *, unsigned long address,
+struct page *follow_page(struct vm_area_struct *, unsigned long address,
                         unsigned int foll_flags);
 #define FOLL_WRITE      0x01    /* check pte is writable */
 #define FOLL_TOUCH      0x02    /* mark page accessed */