fs/mbcache: replace __builtin_log2() with ilog2()

Fix compiler error with some gcc version(s) that do not
support __builtin_log2() by replacing __builtin_log2() with
ilog2().

Signed-off-by: T. Makphaibulchoke <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Reviewed-by: Maciej W. Rozycki <[email protected]>

diff --git a/fs/mbcache.c b/fs/mbcache.c
index bf166e388f0d4cb8b8826698df51fe759aa6f99f..187477ded6b334c8be0196949cf0e7f40c16b40d 100644 (file)
--- 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))