1 files changed, 48 insertions, 16 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2128ef7780c6..6e695eaab4ce 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -41,6 +41,9 @@ extern unsigned long mmap_min_addr;
 
 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
 
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
+
 /*
  * Linux kernel virtual memory manager primitives.
  * The idea being to have a "virtual" mm in the same way
@@ -100,6 +103,7 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_DONTEXPAND   0x00040000      /* Cannot expand with mremap() */
 #define VM_RESERVED     0x00080000      /* Count as reserved_vm like IO */
 #define VM_ACCOUNT      0x00100000      /* Is a VM accounted object */
+#define VM_NORESERVE    0x00200000      /* should the VM suppress accounting */
 #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) */
@@ -166,12 +170,16 @@ struct vm_operations_struct {
         void (*open)(struct vm_area_struct * area);
         void (*close)(struct vm_area_struct * area);
         int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
-        unsigned long (*nopfn)(struct vm_area_struct *area,
-                        unsigned long address);
 
         /* notification that a previously read-only page is about to become
          * writable, if an error is returned it will cause a SIGBUS */
         int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
+
+        /* called by access_process_vm when get_user_pages() fails, typically
+         * for use by special VMAs that can switch between memory and hardware
+         */
+        int (*access)(struct vm_area_struct *vma, unsigned long addr,
+                      void *buf, int len, int write);
 #ifdef CONFIG_NUMA
         /*
          * set_policy() op must add a reference to any non-NULL @new mempolicy
@@ -675,13 +683,6 @@ static inline int page_mapped(struct page *page)
 }
 
 /*
- * Error return values for the *_nopfn functions
- */
-#define NOPFN_SIGBUS    ((unsigned long) -1)
-#define NOPFN_OOM       ((unsigned long) -2)
-#define NOPFN_REFAULT   ((unsigned long) -3)
-
-/*
  * Different kinds of faults, as returned by handle_mm_fault().
  * Used to decide whether a process gets delivered SIGBUS or
  * just gets major/minor fault counters bumped up.
@@ -772,14 +773,14 @@ struct mm_walk {
 
 int walk_page_range(unsigned long addr, unsigned long end,
                 struct mm_walk *walk);
-void free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
+void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
                 unsigned long end, unsigned long floor, unsigned long ceiling);
-void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma,
-                unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
                         struct vm_area_struct *vma);
 void unmap_mapping_range(struct address_space *mapping,
                 loff_t const holebegin, loff_t const holelen, int even_cows);
+int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
+                        void *buf, int len, int write);
 
 static inline void unmap_shared_mapping_range(struct address_space *mapping,
                 loff_t const holebegin, loff_t const holelen)
@@ -809,7 +810,6 @@ extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *
 
 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
                 int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
-void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long);
 
 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
 extern void do_invalidatepage(struct page *page, unsigned long offset);
@@ -832,6 +832,39 @@ extern int mprotect_fixup(struct vm_area_struct *vma,
                           struct vm_area_struct **pprev, unsigned long start,
                           unsigned long end, unsigned long newflags);
 
+#ifdef CONFIG_HAVE_GET_USER_PAGES_FAST
+/*
+ * get_user_pages_fast provides equivalent functionality to get_user_pages,
+ * operating on current and current->mm (force=0 and doesn't return any vmas).
+ *
+ * get_user_pages_fast may take mmap_sem and page tables, so no assumptions
+ * can be made about locking. get_user_pages_fast is to be implemented in a
+ * way that is advantageous (vs get_user_pages()) when the user memory area is
+ * already faulted in and present in ptes. However if the pages have to be
+ * faulted in, it may turn out to be slightly slower).
+ */
+int get_user_pages_fast(unsigned long start, int nr_pages, int write,
+                        struct page **pages);
+
+#else
+/*
+ * Should probably be moved to asm-generic, and architectures can include it if
+ * they don't implement their own get_user_pages_fast.
+ */
+#define get_user_pages_fast(start, nr_pages, write, pages)      \
+({                                                              \
+        struct mm_struct *mm = current->mm;                     \
+        int ret;                                                \
+                                                                \
+        down_read(&mm->mmap_sem);                               \
+        ret = get_user_pages(current, mm, start, nr_pages,      \
+                                        write, 0, pages, NULL); \
+        up_read(&mm->mmap_sem);                                 \
+                                                                \
+        ret;                                                    \
+})
+#endif
+
 /*
  * A callback you can register to apply pressure to ageable caches.
  *
@@ -965,9 +998,8 @@ static inline void pgtable_page_dtor(struct page *page)
                 NULL: pte_offset_kernel(pmd, address))
 
 extern void free_area_init(unsigned long * zones_size);
-extern void free_area_init_node(int nid, pg_data_t *pgdat,
-        unsigned long * zones_size, unsigned long zone_start_pfn, 
-        unsigned long *zholes_size);
+extern void free_area_init_node(int nid, unsigned long * zones_size,
+                unsigned long zone_start_pfn, unsigned long *zholes_size);
 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
 /*
  * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its