linux-kernel - Re: [PATCH] netfilter: nf_tables: replace unnecessary use of list_for_each_entry

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Message-ID: <20220320004429.GD13956@breakpoint.cc>
Date:   Sun, 20 Mar 2022 01:44:29 +0100
From:   Florian Westphal <fw@...len.de>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, netdev@...r.kernel.org,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mike Rapoport <rppt@...nel.org>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: Re: [PATCH] netfilter: nf_tables: replace unnecessary use of
 list_for_each_entry_continue()

Jakob Koschel <jakobkoschel@...il.com> wrote:
> Since there is no way for the previous list_for_each_entry() to exit
> early, this call to list_for_each_entry_continue() is always guaranteed
> to start with the first element of the list and can therefore be
> replaced with a call to list_for_each_entry().
> 
> In preparation to limit the scope of the list iterator to the list
> traversal loop, the list iterator variable 'rule' should not be used
> past the loop.
> 
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
>  
> -	list_for_each_entry_continue(rule, &chain->rules, list) {
> +	list_for_each_entry(rule, &chain->rules, list) {
>  		if (!nft_is_active_next(net, rule))
>  			continue;

You could also replace the first entry_continue and get rid of the
preceeding
	rule = list_entry().