On Sat, 02 Jun 2018, Herbert Xu wrote:
On Fri, Jun 01, 2018 at 09:01:21AM -0700, Davidlohr Bueso wrote:
For the purpose of making rhashtable_init() unable to fail,
we can replace the returning -EINVAL with WARN_ONs whenever
the caller passes bogus parameters during initialization.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
lib/rhashtable.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 9427b5766134..05a4b1b8b8ce 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -1024,12 +1024,11 @@ int rhashtable_init(struct rhashtable *ht,
size = HASH_DEFAULT_SIZE;
- if ((!params->key_len && !params->obj_hashfn) ||
- (params->obj_hashfn && !params->obj_cmpfn))
- return -EINVAL;
+ WARN_ON((!params->key_len && !params->obj_hashfn) ||
+ (params->obj_hashfn && !params->obj_cmpfn));
- if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT))
- return -EINVAL;
+ WARN_ON(params->nulls_base &&
+ params->nulls_base < (1U << RHT_BASE_SHIFT));
I still don't like this.
Yes for your use-case you will never crash and a WARN_ON is fine.
However, rhashtable is used in all sorts of contexts and returning
an error makes sense for quite a number of them.
Curious, are these users setting up the param structure dynamically
or something that they can pass along bogus values?
If that's the case then yes, I definitely agree.
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