From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Yonghong Song <yhs@fb.com>
Cc: bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Kernel Team <kernel-team@fb.com>,
Michal Kubecek <mkubecek@suse.cz>
Subject: Re: [PATCH bpf] bpf: fix "unresolved symbol" build error with resolve_btfids
Date: Wed, 30 Sep 2020 11:40:37 -0700 [thread overview]
Message-ID: <CAEf4BzZKqrKPifnJmX8fabmXCVRK45ERiEy5aHGFJ9dg0c2oAA@mail.gmail.com> (raw)
In-Reply-To: <20200930164109.2922412-1-yhs@fb.com>
On Wed, Sep 30, 2020 at 9:41 AM Yonghong Song <yhs@fb.com> 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, omit the above two types for BTF_SOCK_TYPE_xxx
> macro if CONFIG_INET is not defined.
>
> Fixes: fce557bcef11 ("bpf: Make btf_sock_ids global")
> Reported-by: Michal Kubecek <mkubecek@suse.cz>
> Signed-off-by: Yonghong Song <yhs@fb.com>
> ---
> include/linux/btf_ids.h | 20 ++++++++++++++++----
> 1 file changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> index 4867d549e3c1..d9a1e18d0921 100644
> --- a/include/linux/btf_ids.h
> +++ b/include/linux/btf_ids.h
> @@ -102,24 +102,36 @@ asm( \
> * skc_to_*_sock() helpers. All these sockets should have
> * sock_common as the first argument in its memory layout.
> */
> -#define BTF_SOCK_TYPE_xxx \
> +
> +#define __BTF_SOCK_TYPE_xxx \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock) \
> - BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock) \
> - BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \
> BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock)
>
> +#define __BTF_SOCK_TW_TYPE_xxx \
> + BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \
> + BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock)
> +
> +#ifdef CONFIG_INET
> +#define BTF_SOCK_TYPE_xxx \
> + __BTF_SOCK_TYPE_xxx \
> + __BTF_SOCK_TW_TYPE_xxx
> +#else
> +#define BTF_SOCK_TYPE_xxx __BTF_SOCK_TYPE_xxx
> +#endif
> +
> enum {
> #define BTF_SOCK_TYPE(name, str) name,
> -BTF_SOCK_TYPE_xxx
> +__BTF_SOCK_TYPE_xxx
> +__BTF_SOCK_TW_TYPE_xxx
Why BTF_SOCK_TYPE_xxx doesn't still work here after the above changes?
> #undef BTF_SOCK_TYPE
> MAX_BTF_SOCK_TYPE,
> };
> --
> 2.24.1
>
next prev parent reply other threads:[~2020-09-30 18:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 16:41 [PATCH bpf] bpf: fix "unresolved symbol" build error with resolve_btfids Yonghong Song
2020-09-30 18:40 ` Andrii Nakryiko [this message]
2020-09-30 19:24 ` Yonghong Song
2020-09-30 19:44 ` Andrii Nakryiko
2020-09-30 20:58 ` Martin KaFai Lau
2020-09-30 22:50 ` Yonghong Song
2020-09-30 22:59 ` Martin KaFai Lau
2020-10-01 1:00 ` Yonghong Song
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