linux-kernel - Re: [PATCH] bpf: devmap: Pass lockdep expression to RCU lists

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Date:   Thu, 23 Jan 2020 14:38:10 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Amol Grover <frextrite@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Joel Fernandes <joel@...lfernandes.org>,
        Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Amol Grover <frextrite@...il.com>
Subject: Re: [PATCH] bpf: devmap: Pass lockdep expression to RCU lists

Amol Grover <frextrite@...il.com> writes:

> head is traversed using hlist_for_each_entry_rcu outside an
> RCU read-side critical section but under the protection
> of dtab->index_lock.
>
> Hence, add corresponding lockdep expression to silence false-positive
> lockdep warnings, and harden RCU lists.
>
> Signed-off-by: Amol Grover <frextrite@...il.com>

Could you please add an appropriate Fixes: tag?

Otherwise:
Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>