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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>
This commit is contained in:
Akinobu Mita 2012-07-30 14:40:59 -07:00 committed by Linus Torvalds
parent 9b58f6d4aa
commit 8fb980e35b
1 changed files with 2 additions and 11 deletions
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13
drivers/md/dm-log.c
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@ -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 */