netdev - Re: [PATCH net] netfilter: nf_tables: prefer kfree

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Date:   Tue, 22 Feb 2022 20:46:05 +0100
From:   Florian Westphal <fw@...len.de>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net] netfilter: nf_tables: prefer kfree_rcu(ptr, rcu)
 variant

Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> While kfree_rcu(ptr) _is_ supported, it has some limitations.
> 
> Given that 99.99% of kfree_rcu() users [1] use the legacy
> two parameters variant, and @catchall objects do have an rcu head,
> simply use it.
> 
> Choice of kfree_rcu(ptr) variant was probably not intentional.

In case someone wondered, this causes expensive
sycnhronize_rcu + kfree for each removal operation.

Reviewed-by: Florian Westphal <fw@...len.de>