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

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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 <tmac@hp.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
This commit is contained in:
T Makphaibulchoke 2014-06-25 22:08:29 -04:00 committed by Theodore Ts'o
parent c5c7b8ddfb
commit ec7756ae15
1 changed files with 2 additions and 1 deletions
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3
fs/mbcache.c
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@ -73,6 +73,7 @@
#include <linux/mbcache.h> #include <linux/mbcache.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/blockgroup_lock.h> #include <linux/blockgroup_lock.h>
#include <linux/log2.h>
#ifdef MB_CACHE_DEBUG #ifdef MB_CACHE_DEBUG
# define mb_debug(f...) do { \ # define mb_debug(f...) do { \
@ -93,7 +94,7 @@
#define MB_CACHE_WRITER ((unsigned short)~0U >> 1) #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) \ #define MB_CACHE_ENTRY_LOCK_INDEX(ce) \
(hash_long((unsigned long)ce, MB_CACHE_ENTRY_LOCK_BITS)) (hash_long((unsigned long)ce, MB_CACHE_ENTRY_LOCK_BITS))