1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e2fa375e478e..3b09444121d9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -199,6 +199,10 @@ struct vm_operations_struct {
         void (*close)(struct vm_area_struct * area);
         struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
         int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
+
+        /* 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);
 #ifdef CONFIG_NUMA
         int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
         struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
@@ -465,10 +469,13 @@ static inline unsigned long page_zonenum(struct page *page)
 struct zone;
 extern struct zone *zone_table[];
 
+static inline int page_zone_id(struct page *page)
+{
+        return (page->flags >> ZONETABLE_PGSHIFT) & ZONETABLE_MASK;
+}
 static inline struct zone *page_zone(struct page *page)
 {
-        return zone_table[(page->flags >> ZONETABLE_PGSHIFT) &
-                        ZONETABLE_MASK];
+        return zone_table[page_zone_id(page)];
 }
 
 static inline unsigned long page_to_nid(struct page *page)