Re: [PATCH 2/6] lib/rhashtable: guarantee initial hashtable allocation

From: Herbert Xu
Date: Mon May 28 2018 - 06:02:55 EST


On Thu, May 24, 2018 at 02:11:31PM -0700, Davidlohr Bueso wrote:
>
> + /*
> + * This is api initialization and thus we need to guarantee the
> + * initial rhashtable allocation. Upon failure, retry with a
> + * smallest possible size, otherwise we exhaust our options with
> + * __GFP_NOFAIL.
> + */
> tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
> - if (tbl == NULL)
> - return -ENOMEM;
> + if (unlikely(tbl == NULL)) {
> + size = HASH_MIN_SIZE;

You should also take min_size into account. Yes I know the current
code ignores it unless you also set nelem_hint. But that's just a
bug.

Cheers,
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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