Messages in this thread | | | Date | Sat, 29 Mar 2008 23:27:10 -0400 | From | Bob Copeland <> | Subject | Re: [PATCH 5/7] omfs: add bitmap routines |
| |
On Fri, Mar 28, 2008 at 04:51:10AM +0100, Arnd Bergmann wrote: > On Thursday 27 March 2008, Bob Copeland wrote: > > > +unsigned long omfs_count_free(struct super_block *sb) > > I think it would be helpful to express this using hweight64.
Here's a version with hweight64:
+unsigned long omfs_count_free(struct super_block *sb) +{ + unsigned int i, j; + u64 *map; + unsigned long sum = 0; + struct omfs_sb_info *sbi = OMFS_SB(sb); + + for (i = 0; i < sbi->s_imap_size; i++) { + map = (u64 *) sbi->s_imap[i]; + for (j = 0; j < sb->s_blocksize / 8; j++) + sum += hweight64(~map[j]); + } + return sum; +}
-- Bob Copeland %% www.bobcopeland.com
| |