netdev - Re: [RFC PATCH 01/29] fib_trie: Convert fib

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Date:	Wed, 25 Feb 2015 01:09:33 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Alexander Duyck <alexander.h.duyck@...hat.com>
cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH 01/29] fib_trie: Convert fib_alias to hlist from
 list


	Hello,

On Tue, 24 Feb 2015, Alexander Duyck wrote:

> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index 3daf022..e0d44b7 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c

> @@ -1192,8 +1193,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
>  		 */
>  		fa_match = NULL;
>  		fa_first = fa;
> -		fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
> -		list_for_each_entry_continue(fa, fa_head, fa_list) {
> +		hlist_for_each_entry_from(fa, fa_list) {
>  			if (fa->fa_tos != tos)
>  				break;
>  			if (fa->fa_info->fib_priority != fi->fib_priority)

	Also, as this loop when implemented as hlist
can exit with fa = NULL we have to use fa_last = fa at
end of loop:

		hlist_for_each_entry_from(fa, fa_list) {
			if (fa->fa_tos != tos)
				break;
			if (fa->fa_info->fib_priority != fi->fib_priority)
				break;
			if (fa->fa_type == cfg->fc_type &&
			    fa->fa_info == fi) {
				fa_match = fa;
				break;
			}
+			fa_last = fa;
		}

	It is needed so that NLM_F_APPEND can work.
Basicly, if list_for_* end with pos pointing to head,
hlist_for_* end with NULL.

Regards

--
Julian Anastasov <ja@....bg>
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