linux-kernel - Re: [PATCH 1/2] [net-next] bpf: fix link error without CONFIG

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Date:   Thu, 2 Nov 2017 10:55:30 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Edward Cree <ecree@...arflare.com>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] [net-next] bpf: fix link error without CONFIG_NET

On Thu,  2 Nov 2017 12:05:51 +0100, Arnd Bergmann wrote:
> I ran into this link error with the latest net-next plus linux-next
> trees when networking is disabled:
> 
> kernel/bpf/verifier.o:(.rodata+0x2958): undefined reference to `tc_cls_act_analyzer_ops'
> kernel/bpf/verifier.o:(.rodata+0x2970): undefined reference to `xdp_analyzer_ops'
> 
> It seems that the code was written to deal with varying contents of
> the arrray, but the actual #ifdef was missing. Both tc_cls_act_analyzer_ops
> and xdp_analyzer_ops are defined in the core networking code, so adding
> a check for CONFIG_NET seems appropriate here, and I've verified this with
> many randconfig builds
> 
> Fixes: 4f9218aaf8a4 ("bpf: move knowledge about post-translation offsets out of verifier")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks Arnd!  I was hoping to nuke this code before build bots catch up
to me, didn't work out :)