3 files changed, 20 insertions, 18 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 57a9fa34f159..0ac87d9ee9d8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2868,5 +2868,12 @@ void __init setup_nr_node_ids(void);
 static inline void setup_nr_node_ids(void) {}
 #endif
 
+extern int memcmp_pages(struct page *page1, struct page *page2);
+
+static inline int pages_identical(struct page *page1, struct page *page2)
+{
+        return !memcmp_pages(page1, page2);
+}
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */
diff --git a/mm/ksm.c b/mm/ksm.c
index 3dc4346411e4..dbee2eb4dd05 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1029,24 +1029,6 @@ static u32 calc_checksum(struct page *page)
         return checksum;
 }
 
-static int memcmp_pages(struct page *page1, struct page *page2)
-{
-        char *addr1, *addr2;
-        int ret;
-
-        addr1 = kmap_atomic(page1);
-        addr2 = kmap_atomic(page2);
-        ret = memcmp(addr1, addr2, PAGE_SIZE);
-        kunmap_atomic(addr2);
-        kunmap_atomic(addr1);
-        return ret;
-}
-
-static inline int pages_identical(struct page *page1, struct page *page2)
-{
-        return !memcmp_pages(page1, page2);
-}
-
 static int write_protect_page(struct vm_area_struct *vma, struct page *page,
                               pte_t *orig_pte)
 {
diff --git a/mm/util.c b/mm/util.c
index bab284d69c8c..37f7b6711514 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -783,3 +783,16 @@ out_mm:
 out:
         return res;
 }
+
+int memcmp_pages(struct page *page1, struct page *page2)
+{
+        char *addr1, *addr2;
+        int ret;
+
+        addr1 = kmap_atomic(page1);
+        addr2 = kmap_atomic(page2);
+        ret = memcmp(addr1, addr2, PAGE_SIZE);
+        kunmap_atomic(addr2);
+        kunmap_atomic(addr1);
+        return ret;
+}