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From:   Masami Hiramatsu <masami.hiramatsu@linaro.org>
Date:   Wed, 28 Nov 2018 01:11:22 +0900
Message-ID: <CAA93ih1-xpm1P0suT6SNCc_ARvAfyBEwb0-uKFikM5k4CvG8jg@mail.gmail.com>
Subject: Re: File not found: /sys/kernel/debug/tracing/events/syscalls
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     Linux kernel mailing list <linux-kernel@vger.kernel.org>,
        "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        Masami Hiramatsu <mhiramat@kernel.org>
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Hi,

I found that the commit 4378a7d4be30 ("arm64: implement syscall
wrappers") changed
the syscall wrapper function names by adding __arm64_ prefix. So arm64
kernel should
have its own arch_syscall_match_sym_name().

Thank you,

2018=E5=B9=B411=E6=9C=8828=E6=97=A5(=E6=B0=B4) 0:22 Naresh Kamboju <naresh.=
kamboju@linaro.org>:
>
> While debugging the selftests/bpf: get_cgroup_id_user test failure on arm=
64
> where the test is expecting trace file
> /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id
> but this path not enabled after enabling required kernel configuration al=
so.
> CONFIG_FTRACE_SYSCALLS=3Dy
>
> strace output:
> open(\"/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id\"=
,
> O_RDONLY) =3D -1 ENOENT (No such file or directory)
>
> This problem noticed on Linux mainline kernel version 4.20.0-rc3.
>
> Best regards
> Naresh Kamboju


--=20
Masami Hiramatsu