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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Mon, 17 Jun 2019 08:26:29 -0700
Message-ID: <CAADnVQ+LzuNHFyLae0vUAudZpOFQ4cA02OC0zu3ypis+gqnjew@mail.gmail.com>
Subject: Re: [PATCH] bpf: hide do_bpf_send_signal when unused
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andriin@fb.com>, Yonghong Song <yhs@fb.com>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>,
        Matt Mullins <mmullins@fb.com>,
        Network Development <netdev@vger.kernel.org>,
        bpf <bpf@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
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On Mon, Jun 17, 2019 at 5:59 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> When CONFIG_MODULES is disabled, this function is never called:
>
> kernel/trace/bpf_trace.c:581:13: error: 'do_bpf_send_signal' defined but not used [-Werror=unused-function]

hmm. it should work just fine without modules.
the bug is somewhere else.