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ext4: code cleanup in mb_find_buddy() 

Current code calculate max no matter whether order is zero, it's
unnecessary. This cleanup patch sets max to "1 << (e4b->bd_blkbits
+ 3)" only when order == 0.

Signed-off-by: Coly Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
This commit is contained in:
Coly Li 2011-02-24 12:51:59 -05:00 committed by Theodore Ts'o
parent ea66333694
commit 84b775a354
1 changed files with 3 additions and 2 deletions
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5
fs/ext4/mballoc.c
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@ -432,9 +432,10 @@ static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
} }
/* at order 0 we see each particular block */ /* at order 0 we see each particular block */
*max = 1 << (e4b->bd_blkbits + 3); if (order == 0) {
if (order == 0) *max = 1 << (e4b->bd_blkbits + 3);
return EXT4_MB_BITMAP(e4b); return EXT4_MB_BITMAP(e4b);
}
bb = EXT4_MB_BUDDY(e4b) + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order]; bb = EXT4_MB_BUDDY(e4b) + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order];
*max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order]; *max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order];