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-rw-r--r--include/linux/rmap.h14
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 */