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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: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Robert P. J. Day 2008-02-08 02:10:06 +00:00 committed by Alasdair G Kergon
parent 82d601dc07
commit 8defd83084
1 changed files with 1 additions and 12 deletions
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13
drivers/md/dm-snap.c
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@ -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;