diff options
| author | Akinobu Mita <akinobu.mita@gmail.com> | 2012-07-30 14:40:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:16 -0700 |
| commit | 8fb980e35b41bbb79aa47f48839d95f0354af3c4 (patch) | |
| tree | dbc1395e9a1cc27911e597ed83bad9c126335891 /drivers/md/dm-log.c | |
| parent | 9b58f6d4aaef070bf6e0744713b6d2b6fc1b3578 (diff) | |
| download | lwn-8fb980e35b41bbb79aa47f48839d95f0354af3c4.tar.gz lwn-8fb980e35b41bbb79aa47f48839d95f0354af3c4.zip | |
dm: use memweight()
Use memweight() to count the total number of bits set in memory area.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Alasdair Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md/dm-log.c')
| -rw-r--r-- | drivers/md/dm-log.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c index 65ebaebf502b..627d19186d5a 100644 --- a/drivers/md/dm-log.c +++ b/drivers/md/dm-log.c @@ -571,16 +571,6 @@ static void disk_dtr(struct dm_dirty_log *log) destroy_log_context(lc); } -static int count_bits32(uint32_t *addr, unsigned size) -{ - int count = 0, i; - - for (i = 0; i < size; i++) { - count += hweight32(*(addr+i)); - } - return count; -} - static void fail_log_device(struct log_c *lc) { if (lc->log_dev_failed) @@ -629,7 +619,8 @@ static int disk_resume(struct dm_dirty_log *log) /* copy clean across to sync */ memcpy(lc->sync_bits, lc->clean_bits, size); - lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); + lc->sync_count = memweight(lc->clean_bits, + lc->bitset_uint32_count * sizeof(uint32_t)); lc->sync_search = 0; /* set the correct number of regions in the header */ |