1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index fed6f5e0b411..955667e6a52d 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -117,6 +117,19 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
  */
 int page_mkclean(struct page *);
 
+#ifdef CONFIG_UNEVICTABLE_LRU
+/*
+ * called in munlock()/munmap() path to check for other vmas holding
+ * the page mlocked.
+ */
+int try_to_munlock(struct page *);
+#else
+static inline int try_to_munlock(struct page *page)
+{
+        return 0;       /* a.k.a. SWAP_SUCCESS */
+}
+#endif
+
 #else   /* !CONFIG_MMU */
 
 #define anon_vma_init()         do {} while (0)
@@ -140,5 +153,6 @@ static inline int page_mkclean(struct page *page)
 #define SWAP_SUCCESS    0
 #define SWAP_AGAIN      1
 #define SWAP_FAIL       2
+#define SWAP_MLOCK      3
 
 #endif  /* _LINUX_RMAP_H */