linux-kernel - Re: [PATCH v3] selftests/ftrace: Do not trace do_softirq because of PREEMPT

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Message-ID: <8f034cd5-8495-de0e-6a3c-4d002e49cc51@linuxfoundation.org>
Date:   Mon, 14 Feb 2022 11:33:18 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org, joseph.salisbury@...onical.com,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] selftests/ftrace: Do not trace do_softirq because of
 PREEMPT_RT

On 2/14/22 4:19 AM, Sebastian Andrzej Siewior wrote:
> On 2022-02-14 09:36:57 [+0100], Krzysztof Kozlowski wrote:
>> The PREEMPT_RT patchset does not use do_softirq() function thus trying
>> to filter for do_softirq fails for such kernel:
>>
>>    echo do_softirq
>>    ftracetest: 81: echo: echo: I/O error
>>
>> Choose some other visible function for the test.  The function does not
>> have to be actually executed during the test, because it is only testing
>> filter API interface.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>
>> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 
> Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
>> Notes:
>> I understand that the failure does not exist on mainline kernel (only
>> with PREEMPT_RT patchset) but the change does not harm it.
> 

Steve,

Would you like me to take this through linux-kselftest next for 5.18-rc1

I am guessing there is no urgency on this - of not I can take this in for
rc5.

thanks,
-- Shuah