1 files changed, 23 insertions, 1 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9c5111f49a32..d1f60d5fe2ea 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -86,6 +86,11 @@ enum zone_stat_item {
         NR_ACTIVE_ANON,         /*  "     "     "   "       "         */
         NR_INACTIVE_FILE,       /*  "     "     "   "       "         */
         NR_ACTIVE_FILE,         /*  "     "     "   "       "         */
+#ifdef CONFIG_UNEVICTABLE_LRU
+        NR_UNEVICTABLE,         /*  "     "     "   "       "         */
+#else
+        NR_UNEVICTABLE = NR_ACTIVE_FILE, /* avoid compiler errors in dead code */
+#endif
         NR_ANON_PAGES,  /* Mapped anonymous pages */
         NR_FILE_MAPPED, /* pagecache pages mapped into pagetables.
                            only modified from process context */
@@ -128,10 +133,18 @@ enum lru_list {
         LRU_ACTIVE_ANON = LRU_BASE + LRU_ACTIVE,
         LRU_INACTIVE_FILE = LRU_BASE + LRU_FILE,
         LRU_ACTIVE_FILE = LRU_BASE + LRU_FILE + LRU_ACTIVE,
-        NR_LRU_LISTS };
+#ifdef CONFIG_UNEVICTABLE_LRU
+        LRU_UNEVICTABLE,
+#else
+        LRU_UNEVICTABLE = LRU_ACTIVE_FILE, /* avoid compiler errors in dead code */
+#endif
+        NR_LRU_LISTS
+};
 
 #define for_each_lru(l) for (l = 0; l < NR_LRU_LISTS; l++)
 
+#define for_each_evictable_lru(l) for (l = 0; l <= LRU_ACTIVE_FILE; l++)
+
 static inline int is_file_lru(enum lru_list l)
 {
         return (l == LRU_INACTIVE_FILE || l == LRU_ACTIVE_FILE);
@@ -142,6 +155,15 @@ static inline int is_active_lru(enum lru_list l)
         return (l == LRU_ACTIVE_ANON || l == LRU_ACTIVE_FILE);
 }
 
+static inline int is_unevictable_lru(enum lru_list l)
+{
+#ifdef CONFIG_UNEVICTABLE_LRU
+        return (l == LRU_UNEVICTABLE);
+#else
+        return 0;
+#endif
+}
+
 struct per_cpu_pages {
         int count;              /* number of pages in the list */
         int high;               /* high watermark, emptying needed */