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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>, Shuah Khan <shuah@kernel.org>,
        linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-rt-users@vger.kernel.org, joseph.salisbury@canonical.com,
        Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: [PATCH v2] selftests/ftrace: Do not trace do_softirq because of
 PREEMPT_RT
Message-ID: <YgUXcGC1mH7VX1d9@linutronix.de>
References: <20220210083356.11212-1-krzysztof.kozlowski@canonical.com>
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On 2022-02-10 09:33:56 [+0100], Krzysztof Kozlowski wrote:
> The PREEMPT_RT patchset does not use soft IRQs thus trying to filter for
> do_softirq fails for such kernel:

PREEMPT_RT does use soft IRQs.

>   echo do_softirq
>   ftracetest: 81: echo: echo: I/O error
>=20
> Choose some other visible function for the test.
>=20
=E2=80=A6

> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc
> @@ -19,7 +19,7 @@ fail() { # mesg
> =20
>  FILTER=3Dset_ftrace_filter
>  FUNC1=3D"schedule"
> -FUNC2=3D"do_softirq"
> +FUNC2=3D"scheduler_tick"

What is the purpose of this?

>  ALL_FUNCS=3D"#### all functions enabled ####"
> =20

Sebastian