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pahole currently only generates the btf_id for external function and
ftrace-able function. Some functions in the bpf_tcp_ca_kfunc_ids
are static (e.g. cubictcp_init). Thus, unless CONFIG_DYNAMIC_FTRACE
is set, btf_ids for those functions will not be generated and the
compilation fails during resolve_btfids.
This patch limits those functions to CONFIG_DYNAMIC_FTRACE. I will
address the pahole generation in a followup and then remove the
CONFIG_DYNAMIC_FTRACE limitation.
Fixes: e78aea8b2170 ("bpf: tcp: Put some tcp cong functions in allowlist for bpf-tcp-cc")
Reported-by: Cong Wang <xiyou.wangcong@gmail.com>
Reported-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210329221357.834438-1-kafai@fb.com