linux-kernel - Re: [PATCH] net: vrf: avoid gcc-4.6 warning

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Message-Id: <20170915.142244.2005612745314498019.davem@davemloft.net>
Date:   Fri, 15 Sep 2017 14:22:44 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     dsa@...ulusnetworks.com, shm@...ulusnetworks.com, ja@....bg,
        mschiffer@...verse-factory.net, weiwan@...gle.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: vrf: avoid gcc-4.6 warning

From: Arnd Bergmann <arnd@...db.de>
Date: Tue, 12 Sep 2017 22:10:53 +0200

> When building an allmodconfig kernel with gcc-4.6, we get a rather
> odd warning:
> 
> drivers/net/vrf.c: In function ‘vrf_ip6_input_dst’:
> drivers/net/vrf.c:964:3: error: initialized field with side-effects overwritten [-Werror]
> drivers/net/vrf.c:964:3: error: (near initialization for ‘fl6’) [-Werror]
> 
> I have no idea what this warning is even trying to say, but it does
> seem like a false positive. Reordering the initialization in to match
> the structure definition gets rid of the warning, and might also avoid
> whatever gcc thinks is wrong here.
> 
> Fixes: 9ff74384600a ("net: vrf: Handle ipv6 multicast and link-local addresses")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

That's extremely weird, I can't explain it either.

Oh well, applied, thanks.