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

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Date:   Wed, 3 May 2017 14:32:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

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.

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

With -Og, there were a couple of other instances of BUILD_BUG_ON() failing
to see a compile-time constant, presumably as it fails to inline any functions
that are not explicitly marked inline.

       Arnd