2 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index 157d83dbaef..bed5f16ba82 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -88,6 +88,9 @@ static inline struct page *ksm_might_need_to_copy(struct page *page,
 int page_referenced_ksm(struct page *page,
                         struct mem_cgroup *memcg, unsigned long *vm_flags);
 int try_to_unmap_ksm(struct page *page, enum ttu_flags flags);
+int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
+                  struct vm_area_struct *, unsigned long, void *), void *arg);
+void ksm_migrate_page(struct page *newpage, struct page *oldpage);
 
 #else  /* !CONFIG_KSM */
 
@@ -127,6 +130,16 @@ static inline int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
 {
         return 0;
 }
+
+static inline int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page*,
+                struct vm_area_struct *, unsigned long, void *), void *arg)
+{
+        return 0;
+}
+
+static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage)
+{
+}
 #endif /* !CONFIG_KSM */
 
 #endif /* __LINUX_KSM_H */
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 980094a527e..b019ae64e2a 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -164,6 +164,12 @@ struct anon_vma *page_lock_anon_vma(struct page *page);
 void page_unlock_anon_vma(struct anon_vma *anon_vma);
 int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
 
+/*
+ * Called by migrate.c to remove migration ptes, but might be used more later.
+ */
+int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
+                struct vm_area_struct *, unsigned long, void *), void *arg);
+
 #else   /* !CONFIG_MMU */
 
 #define anon_vma_init()         do {} while (0)