1 files changed, 26 insertions, 7 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index 2fd2ad5da98e..53cab10fece4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -173,8 +173,8 @@ unsigned int kobjsize(const void *objp)
 }
 
 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
-                     unsigned long start, int len, int flags,
-                struct page **pages, struct vm_area_struct **vmas)
+                     unsigned long start, int nr_pages, int flags,
+                     struct page **pages, struct vm_area_struct **vmas)
 {
         struct vm_area_struct *vma;
         unsigned long vm_flags;
@@ -189,7 +189,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
         vm_flags  = write ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
         vm_flags &= force ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
 
-        for (i = 0; i < len; i++) {
+        for (i = 0; i < nr_pages; i++) {
                 vma = find_vma(mm, start);
                 if (!vma)
                         goto finish_or_fault;
@@ -224,7 +224,7 @@ finish_or_fault:
  * - don't permit access to VMAs that don't support it, such as I/O mappings
  */
 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
-        unsigned long start, int len, int write, int force,
+        unsigned long start, int nr_pages, int write, int force,
         struct page **pages, struct vm_area_struct **vmas)
 {
         int flags = 0;
@@ -234,12 +234,31 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
         if (force)
                 flags |= GUP_FLAGS_FORCE;
 
-        return __get_user_pages(tsk, mm,
-                                start, len, flags,
-                                pages, vmas);
+        return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas);
 }
 EXPORT_SYMBOL(get_user_pages);
 
+/**
+ * follow_pfn - look up PFN at a user virtual address
+ * @vma: memory mapping
+ * @address: user virtual address
+ * @pfn: location to store found PFN
+ *
+ * Only IO mappings and raw PFN mappings are allowed.
+ *
+ * Returns zero and the pfn at @pfn on success, -ve otherwise.
+ */
+int follow_pfn(struct vm_area_struct *vma, unsigned long address,
+        unsigned long *pfn)
+{
+        if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
+                return -EINVAL;
+
+        *pfn = address >> PAGE_SHIFT;
+        return 0;
+}
+EXPORT_SYMBOL(follow_pfn);
+
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;