On Tue, Sep 18, 2018 at 1:20 PM Willem de Bruijn
<willemdebruijn.ker...@gmail.com> wrote:
>
> From: Willem de Bruijn <will...@google.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 <rdun...@infradead.org>
> Signed-off-by: Willem de Bruijn <will...@google.com>
Acked-by: Yonghong Song <y...@fb.com>
