linux-kernel - Re: [RFC 1/4] hashtable: introduce a small and naive hashtable

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Message-ID: <501AAC26.6030703@gmail.com>
Date:	Thu, 02 Aug 2012 18:34:46 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Josh Triplett <josh@...htriplett.org>, Tejun Heo <tj@...nel.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	paul.gortmaker@...driver.com
Subject: Re: [RFC 1/4] hashtable: introduce a small and naive hashtable

On 08/02/2012 06:03 PM, Eric W. Biederman wrote:
> Sasha Levin <levinsasha928@...il.com> writes:
>> On 08/02/2012 12:32 PM, Josh Triplett wrote:
>>> What about using a C99 flexible array member?  Kernel style prohibits
>>> variable-length arrays, but I don't think the same rationale applies to
>>> flexible array members.
>>>
>>> struct hash_table {
>>>     size_t count;
>>>     struct hlist_head buckets[];
>>> };
>>>
>>> #define DEFINE_HASH_TABLE(name, length) struct hash_table name = { .count = length, .buckets = { [0 ... (length - 1)] = HLIST_HEAD_INIT } }
>>
>> The limitation of this approach is that the struct hash_table variable
>> must be 'static', which is a bit limiting - see for example the use of
>> hashtable in 'struct user_namespace'.
> 
> You mean the hash table that was made static in 3.5?
> 
> You might want to try basing your patches on something a little more current.
> 
> Eric
> 

Heh, I've started working on it in April, and just returned to this. Didn't think about rebasing to something new.

will fix - Thanks!
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