netdev - Re: [PATCH bpf v3] bpf: fix "unresolved symbol" build error with resolve

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Message-ID: <20201001155735.ruewjgrskwf536sd@kafai-mbp.dhcp.thefacebook.com>
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>