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Date:   Mon, 7 Sep 2020 20:49:21 -0700
From:   Jakub Kicinski <>
To:     Stephen Rothwell <>,
        Nikolay Aleksandrov <>
Cc:     David Miller <>,
        Networking <>,
        Linux Next Mailing List <>,
        Linux Kernel Mailing List <>
Subject: Re: linux-next: build warning after merge of the net-next tree

On Tue, 8 Sep 2020 13:00:00 +1000 Stephen Rothwell wrote:
> Hi all,
> After merging the net-next tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
> net/bridge/br_multicast.c: In function 'br_multicast_find_port':
> net/bridge/br_multicast.c:1818:21: warning: unused variable 'br' [-Wunused-variable]
>  1818 |  struct net_bridge *br = mp->br;
>       |                     ^~
> Introduced by commit
>   0436862e417e ("net: bridge: mcast: support for IGMPv3/MLDv2 ALLOW_NEW_SOURCES report")
> Maybe turning mlock_dereference into a static inline function would help.

Or perhaps provide a better definition of whatever is making the
reference disappear? RCU_LOCKDEP_WARN()?

Thanks for the report!

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