Commit 09ae0085 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Greg Kroah-Hartman
Browse files

lib/rhashtable: consider param->min_size when setting initial table size

[ Upstream commit 107d01f5ba10f4162c38109496607eb197059064 ]

rhashtable_init() currently does not take into account the user-passed
min_size parameter unless param->nelem_hint is set as well. As such,
the default size (number of buckets) will always be HASH_DEFAULT_SIZE
even if the smallest allowed size is larger than that. Remediate this
by unconditionally calling into rounded_hashtable_size() and handling
things accordingly.
Signed-off-by: default avatarDavidlohr Bueso <>
Acked-by: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 8582bbfb
......@@ -783,8 +783,16 @@ EXPORT_SYMBOL_GPL(rhashtable_walk_stop);
static size_t rounded_hashtable_size(const struct rhashtable_params *params)
return max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
(unsigned long)params->min_size);
size_t retsize;
if (params->nelem_hint)
retsize = max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
(unsigned long)params->min_size);
retsize = max(HASH_DEFAULT_SIZE,
(unsigned long)params->min_size);
return retsize;
static u32 rhashtable_jhash2(const void *key, u32 length, u32 seed)
......@@ -841,8 +849,6 @@ int rhashtable_init(struct rhashtable *ht,
struct bucket_table *tbl;
size_t size;
if ((!params->key_len && !params->obj_hashfn) ||
(params->obj_hashfn && !params->obj_cmpfn))
return -EINVAL;
......@@ -869,8 +875,7 @@ int rhashtable_init(struct rhashtable *ht,
ht->p.min_size = max(ht->p.min_size, HASH_MIN_SIZE);
if (params->nelem_hint)
size = rounded_hashtable_size(&ht->p);
size = rounded_hashtable_size(&ht->p);
/* The maximum (not average) chain length grows with the
* size of the hash table, at a rate of (log N)/(log log N).
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