From e57aa839cea13852e07ecb495692b602b11136c9 Mon Sep 17 00:00:00 2001 From: Fengguang Wu Date: Tue, 16 Oct 2007 23:26:25 -0700 Subject: convert ill defined log2() to ilog2() It's *wrong* to have #define log2(n) ffz(~(n)) It should be *reversed*: #define log2(n) flz(~(n)) or #define log2(n) fls(n) or just use ilog2(n) defined in linux/log2.h. This patch follows the last solution, recommended by Andrew Morton. Cc: Cc: Mingming Cao Cc: Bjorn Helgaas Cc: Chris Ahna Cc: David Mosberger-Tang Cc: Kyle McMartin Cc: Dave Airlie Cc: Dave Jones Signed-off-by: Fengguang Wu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext4/super.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'fs/ext4') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 22158ebfae2..fc3eb79faa4 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1415,8 +1415,6 @@ static void ext4_orphan_cleanup (struct super_block * sb, sb->s_flags = s_flags; /* Restore MS_RDONLY status */ } -#define log2(n) ffz(~(n)) - /* * Maximal file size. There is a direct, and {,double-,triple-}indirect * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. @@ -1689,8 +1687,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); sbi->s_sbh = bh; sbi->s_mount_state = le16_to_cpu(es->s_state); - sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); - sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb)); + sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); + sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); for (i=0; i < 4; i++) sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); sbi->s_def_hash_version = es->s_def_hash_version; -- cgit v1.2.3