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Commit 8fb980e3 authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds
Browse files

dm: use memweight() 



Use memweight() to count the total number of bits set in memory area.

Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Alasdair Kergon <agk@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9b58f6d4

drivers/md/dm-log.c

+2 −11
Original line number Diff line number Diff line
@@ -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 */