netdev - Re: [PATCH] netfilter: conntrack: Force inlining of build check to prevent build failure

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Message-ID: <CAMuHMdUxKE7cPVjg=1xyQ4nx=h5or2p2ZJk+xAkEOfK7fv3YYw@mail.gmail.com>
Date:   Wed, 3 May 2017 14:47:56 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] netfilter: conntrack: Force inlining of build check to
 prevent build failure

Hi Arnd,

On Wed, May 3, 2017 at 2:32 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wed, May 3, 2017 at 2:18 PM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> If gcc (e.g. 4.1.2) decides not to inline total_extension_size(), the
>> build will fail with:
>>
>>     net/built-in.o: In function `nf_conntrack_init_start':
>>     (.text+0x9baf6): undefined reference to `__compiletime_assert_1893'
>>
>> or
>>
>>     ERROR: "__compiletime_assert_1893" [net/netfilter/nf_conntrack.ko] undefined!
>>
>> Fix this by forcing inlining of total_extension_size().
>>
>> Fixes: b3a5db109e0670d6 ("netfilter: conntrack: use u8 for extension sizes again")
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> I saw this as well when I tried building with "gcc-7 -Og", and came to the same
> conclusion.

Good^H^H^H^HBad to see it not only happens with ancient compilers ;-)

> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds