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Date: Thu, 1 Oct 2020 08:57:42 -0700 From: Martin KaFai Lau <kafai@...com> To: Yonghong Song <yhs@...com> CC: <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>, Michal Kubecek <mkubecek@...e.cz> Subject: Re: [PATCH bpf v3] bpf: fix "unresolved symbol" build error with resolve_btfids On Wed, Sep 30, 2020 at 10:13:39PM -0700, Yonghong Song wrote: > Michal reported a build failure likes below: > BTFIDS vmlinux > FAILED unresolved symbol tcp_timewait_sock > make[1]: *** [/.../linux-5.9-rc7/Makefile:1176: vmlinux] Error 255 > > This error can be triggered when config has CONFIG_NET enabled > but CONFIG_INET disabled. In this case, there is no user of > structs inet_timewait_sock and tcp_timewait_sock and hence vmlinux BTF > types are not generated for these two structures. > > To fix the problem, let us force BTF generation for these two > structures with BTF_TYPE_EMIT. Acked-by: Martin KaFai Lau <kafai@...com>
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