1 files changed, 2 insertions, 1 deletions

diff --git a/fs/mbcache.c b/fs/mbcache.c
index bf166e388f0d..187477ded6b3 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -73,6 +73,7 @@
 #include <linux/mbcache.h>
 #include <linux/init.h>
 #include <linux/blockgroup_lock.h>
+#include <linux/log2.h>
 
 #ifdef MB_CACHE_DEBUG
 # define mb_debug(f...) do { \
@@ -93,7 +94,7 @@
 
 #define MB_CACHE_WRITER ((unsigned short)~0U >> 1)
 
-#define MB_CACHE_ENTRY_LOCK_BITS        __builtin_log2(NR_BG_LOCKS)
+#define MB_CACHE_ENTRY_LOCK_BITS        ilog2(NR_BG_LOCKS)
 #define MB_CACHE_ENTRY_LOCK_INDEX(ce)                   \
         (hash_long((unsigned long)ce, MB_CACHE_ENTRY_LOCK_BITS))