linux-kernel - [PATCH 5.19 057/365] mptcp, btf: Add struct mptcp_sock definition when CONFIG

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Message-Id: <20220823080120.567931174@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 09:59:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Martin KaFai Lau <kafai@...com>
Subject: [PATCH 5.19 057/365] mptcp, btf: Add struct mptcp_sock definition when CONFIG_MPTCP is disabled

From: Jiri Olsa <jolsa@...nel.org>

commit f1d41f7720c89705c20e4335a807b1c518c2e7be upstream.

The btf_sock_ids array needs struct mptcp_sock BTF ID for the
bpf_skc_to_mptcp_sock helper.

When CONFIG_MPTCP is disabled, the 'struct mptcp_sock' is not
defined and resolve_btfids will complain with:

  [...]
  BTFIDS  vmlinux
  WARN: resolve_btfids: unresolved symbol mptcp_sock
  [...]

Add an empty definition for struct mptcp_sock when CONFIG_MPTCP
is disabled.

Fixes: 3bc253c2e652 ("bpf: Add bpf_skc_to_mptcp_sock_proto")
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Acked-by: Martin KaFai Lau <kafai@...com>
Link: https://lore.kernel.org/bpf/20220802163324.1873044-1-jolsa@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/mptcp.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -290,4 +290,8 @@ struct mptcp_sock *bpf_mptcp_sock_from_s
 static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
 #endif
 
+#if !IS_ENABLED(CONFIG_MPTCP)
+struct mptcp_sock { };
+#endif
+
 #endif /* __NET_MPTCP_H */