4.9-stable review patch. If anyone has any objections, please let me know.
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From: Davidlohr Bueso dave@stgolabs.net
[ 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: Davidlohr Bueso dbueso@suse.de Acked-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- lib/rhashtable.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
--- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -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); + else + 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 *h struct bucket_table *tbl; size_t size;
- size = HASH_DEFAULT_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 *h
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).