netdev - Re: [PATCH v5] net: ip, diag -- Add diag interface for raw sockets

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Message-ID: <20160928134309.GE1876@uranus.lan>
Date:   Wed, 28 Sep 2016 16:43:09 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        David Ahern <dsa@...ulusnetworks.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
        kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net, avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH v5] net: ip, diag -- Add diag interface for raw sockets

On Wed, Sep 28, 2016 at 06:29:08AM -0700, Eric Dumazet wrote:
> > 
> > Oh, crap :( I've been looking into uapi headers, found that we
> > use anonymous unions (for example include/uapi/linux/bcache.h)
> > and thought it will be safe (and my test builds didn't fail).
> > Are you happen to know which gcc versions cant do that?
> 
> The most recent example I have in mind is a kbuild bot report on the
> recent TCP BBR patches. We had to rework the patch to avoid the problem.
> 
> If I remember well, this was a gcc-4.7, but not on x86.

4.7 is pretty widespread, so I've to think...