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rhashtable: Round up/down min/max_size to ensure we respect limit 

Round up min_size respectively round down max_size to the next power
of two to make sure we always respect the limit specified by the
user. This is required because we compare the table size against the
limit before we expand or shrink.

Also fixes a minor bug where we modified min_size in the params
provided instead of the copy stored in struct rhashtable.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2015-03-19 22:31:13 +00:00 committed by David S. Miller
parent 91a0f93056
commit a998f712f7
1 changed files with 8 additions and 2 deletions
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10
lib/rhashtable.c
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@ -933,8 +933,6 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT))
return -EINVAL;
params->min_size = max(params->min_size, HASH_MIN_SIZE);
if (params->nelem_hint)
size = rounded_hashtable_size(params);
@ -942,6 +940,14 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
mutex_init(&ht->mutex);
memcpy(&ht->p, params, sizeof(*params));
if (params->min_size)
ht->p.min_size = roundup_pow_of_two(params->min_size);
if (params->max_size)
ht->p.max_size = rounddown_pow_of_two(params->max_size);
ht->p.min_size = max(params->min_size, HASH_MIN_SIZE);
if (params->locks_mul)
ht->p.locks_mul = roundup_pow_of_two(params->locks_mul);
else