Commit a998f712 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller

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: default avatarThomas Graf <>
Acked-by: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
parent 91a0f930
......@@ -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)
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);
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