VM: add common helper function to create the page tables

[pandora-kernel.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5c1fb0a..0e73f15 100644 (file)
--- 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
@@ -157,11 +158,12 @@ 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) */
 #define VM_MAPPED_COPY 0x01000000      /* T if mapped copy of data (nommu mmap) */
+#define VM_INCOMPLETE  0x02000000      /* Strange partial PFN mapping marker */
 
 #ifndef VM_STACK_DEFAULT_FLAGS         /* arch can override this */
 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
@@ -206,12 +208,6 @@ struct vm_operations_struct {
 struct mmu_gather;
 struct inode;
 
-#ifdef ARCH_HAS_ATOMIC_UNSIGNED
-typedef unsigned page_flags_t;
-#else
-typedef unsigned long page_flags_t;
-#endif
-
 /*
  * Each physical page in the system has a struct page associated with
  * it to keep track of whatever it is we are using the page for at the
@@ -219,7 +215,7 @@ typedef unsigned long page_flags_t;
  * a page.
  */
 struct page {
-       page_flags_t flags;             /* Atomic flags, some possibly
+       unsigned long flags;            /* Atomic flags, some possibly
                                         * updated asynchronously */
        atomic_t _count;                /* Usage count, see below. */
        atomic_t _mapcount;             /* Count of ptes mapped in mms,
@@ -317,8 +313,6 @@ 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))
@@ -335,23 +329,6 @@ 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
@@ -435,7 +412,7 @@ static inline void put_page(struct page *page)
 #endif
 
 /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
-#define SECTIONS_PGOFF         ((sizeof(page_flags_t)*8) - SECTIONS_WIDTH)
+#define SECTIONS_PGOFF         ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
 #define NODES_PGOFF            (SECTIONS_PGOFF - NODES_WIDTH)
 #define ZONES_PGOFF            (NODES_PGOFF - ZONES_WIDTH)
 
@@ -688,6 +665,7 @@ 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,
@@ -764,6 +742,8 @@ struct shrinker;
 extern struct shrinker *set_shrinker(int, shrinker_t);
 extern void remove_shrinker(struct shrinker *shrinker);
 
+extern pte_t *FASTCALL(get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl));
+
 int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
 int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
@@ -932,13 +912,13 @@ int write_one_page(struct page *page, int wait);
                                         * turning readahead off */
 
 int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                       unsigned long offset, unsigned long nr_to_read);
+                       pgoff_t offset, unsigned long nr_to_read);
 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
-                       unsigned long offset, unsigned long nr_to_read);
-unsigned long  page_cache_readahead(struct address_space *mapping,
+                       pgoff_t offset, unsigned long nr_to_read);
+unsigned long page_cache_readahead(struct address_space *mapping,
                          struct file_ra_state *ra,
                          struct file *filp,
-                         unsigned long offset,
+                         pgoff_t offset,
                          unsigned long size);
 void handle_ra_miss(struct address_space *mapping, 
                    struct file_ra_state *ra, pgoff_t offset);
@@ -946,7 +926,9 @@ unsigned long max_sane_readahead(unsigned long nr);
 
 /* Do stack extension */
 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
+#ifdef CONFIG_IA64
 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
+#endif
 
 /* Look up the first VMA which satisfies  addr < vm_end,  NULL if none. */
 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
@@ -975,7 +957,7 @@ 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 */