netdev - Re: [PATCH net] ipv4: Silence suspicious RCU usage warning

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Message-ID: <e2e8e329-0d3b-a910-5c40-d63600b6ba14@gmail.com>
Date:   Wed, 26 Aug 2020 13:02:03 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH net] ipv4: Silence suspicious RCU usage warning

On 8/26/20 10:48 AM, Ido Schimmel wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> fib_info_notify_update() is always called with RTNL held, but not from
> an RCU read-side critical section. This leads to the following warning
> [1] when the FIB table list is traversed with
> hlist_for_each_entry_rcu(), but without a proper lockdep expression.
> 
> Since modification of the list is protected by RTNL, silence the warning
> by adding a lockdep expression which verifies RTNL is held.
> 

...

> 
> Fixes: 1bff1a0c9bbd ("ipv4: Add function to send route updates")
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
>  net/ipv4/fib_trie.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 

Thanks, Ido.

Reviewed-by: David Ahern <dsahern@...il.com>