netdev - Re: [PATCH bpf-next] flow_dissector: fix build failure without CONFIG

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Date:   Wed, 19 Sep 2018 23:48:15 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     ast@...nel.org, rdunlap@...radead.org,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next] flow_dissector: fix build failure without
 CONFIG_NET

On 09/18/2018 10:20 PM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> If boolean CONFIG_BPF_SYSCALL is enabled, kernel/bpf/syscall.c will
> call flow_dissector functions from net/core/flow_dissector.c.
> 
> This causes this build failure if CONFIG_NET is disabled:
> 
>     kernel/bpf/syscall.o: In function `__x64_sys_bpf':
>     syscall.c:(.text+0x3278): undefined reference to
>     `skb_flow_dissector_bpf_prog_attach'
>     syscall.c:(.text+0x3310): undefined reference to
>     `skb_flow_dissector_bpf_prog_detach'
>     kernel/bpf/syscall.o:(.rodata+0x3f0): undefined reference to
>     `flow_dissector_prog_ops'
>     kernel/bpf/verifier.o:(.rodata+0x250): undefined reference to
>     `flow_dissector_verifier_ops'
> 
> Analogous to other optional BPF program types in syscall.c, add stubs
> if the relevant functions are not compiled and move the BPF_PROG_TYPE
> definition in the #ifdef CONFIG_NET block.
> 
> Fixes: d58e468b1112 ("flow_dissector: implements flow dissector BPF hook")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied to bpf-next, thanks Willem!