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Commit 8defd830 authored by Robert P. J. Day's avatar Robert P. J. Day Committed by Alasdair G Kergon
Browse files

dm snapshot: use rounddown_pow_of_two 



Since the source file already includes the log2.h header file, it
seems pointless to re-invent the necessary routine.

Signed-off-by: default avatarRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 82d601dc

drivers/md/dm-snap.c

+1 −12
Original line number Diff line number Diff line
@@ -333,16 +333,6 @@ static int calc_max_buckets(void) 
	return mem;

}



/*

 * Rounds a number down to a power of 2.

 */

static uint32_t round_down(uint32_t n)

{

	while (n & (n - 1))

		n &= (n - 1);

	return n;

}



/*

 * Allocate room for a suitable hash table.

 */
@@ -361,8 +351,7 @@ static int init_hash_tables(struct dm_snapshot *s) 
	hash_size = min(origin_dev_size, cow_dev_size) >> s->chunk_shift;

	hash_size = min(hash_size, max_buckets);



	/* Round it down to a power of 2 */

	hash_size = round_down(hash_size);

	hash_size = rounddown_pow_of_two(hash_size);

	if (init_exception_table(&s->complete, hash_size))

		return -ENOMEM;