aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2017-04-28 14:10:48 +0800
committerDavid S. Miller <davem@davemloft.net>2017-04-28 10:14:09 -0400
commit2d2ab658d2debcb4c0e29c9e6f18e5683f3077bf (patch)
tree163eada4e9bf806b7057e5b5843820be1b6d0ff5 /lib
parente221c1f0fe2590042b4f8c3a8ccccd8e7bed2c31 (diff)
rhashtable: Do not lower max_elems when max_size is zero
The commit 6d684e54690c ("rhashtable: Cap total number of entries to 2^31") breaks rhashtable users that do not set max_size. This is because when max_size is zero max_elems is also incorrectly set to zero instead of 2^31. This patch fixes it by only lowering max_elems when max_size is not zero. Fixes: 6d684e54690c ("rhashtable: Cap total number of entries to 2^31") Reported-by: Florian Fainelli <f.fainelli@gmail.com> Reported-by: kernel test robot <fengguang.wu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
-rw-r--r--lib/rhashtable.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 751630bbe409..3895486ef551 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -958,13 +958,14 @@ int rhashtable_init(struct rhashtable *ht,
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);
-
/* Cap total entries at 2^31 to avoid nelems overflow. */
ht->max_elems = 1u << 31;
- if (ht->p.max_size < ht->max_elems / 2)
- ht->max_elems = ht->p.max_size * 2;
+
+ if (params->max_size) {
+ ht->p.max_size = rounddown_pow_of_two(params->max_size);
+ if (ht->p.max_size < ht->max_elems / 2)
+ ht->max_elems = ht->p.max_size * 2;
+ }
ht->p.min_size = max(ht->p.min_size, HASH_MIN_SIZE);

Privacy Policy