linux-kernel - Re: [PATCH bpf] bpf: sockmap: add locking annotations to iterator

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Date:   Wed, 14 Oct 2020 10:46:13 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>, kernel-team@...udflare.com,
        kernel test robot <lkp@...el.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf] bpf: sockmap: add locking annotations to iterator

On Mon, Oct 12, 2020 at 11:18 AM CEST, Lorenz Bauer wrote:
> The sparse checker currently outputs the following warnings:
>
>     include/linux/rcupdate.h:632:9: sparse: sparse: context imbalance in 'sock_hash_seq_start' - wrong count at exit
>     include/linux/rcupdate.h:632:9: sparse: sparse: context imbalance in 'sock_map_seq_start' - wrong count at exit
>
> Add the necessary __acquires and __release annotations to make the
> iterator locking schema palatable to sparse. Also add __must_hold
> for good measure.
>
> The kernel codebase uses both __acquires(rcu) and __acquires(RCU).
> I couldn't find any guidance which one is preferred, so I used
> what is easier to type out.
>
> Fixes: 0365351524d7 ("net: Allow iterating sockmap and sockhash")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---

Acked-by: Jakub Sitnicki <jakub@...udflare.com>