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>
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@ -333,16 +333,6 @@ static int calc_max_buckets(void)
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return mem;
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}
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/*
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* Rounds a number down to a power of 2.
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*/
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static uint32_t round_down(uint32_t n)
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{
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while (n & (n - 1))
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n &= (n - 1);
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return n;
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}
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/*
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* Allocate room for a suitable hash table.
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*/
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@ -361,8 +351,7 @@ static int init_hash_tables(struct dm_snapshot *s)
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hash_size = min(origin_dev_size, cow_dev_size) >> s->chunk_shift;
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hash_size = min(hash_size, max_buckets);
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/* Round it down to a power of 2 */
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hash_size = round_down(hash_size);
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hash_size = rounddown_pow_of_two(hash_size);
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if (init_exception_table(&s->complete, hash_size))
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return -ENOMEM;
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