linux-kernel - Re: [PATCH AUTOSEL 4.19 09/13] selftests/ftrace: Do not trace do_softirq because of PREEMPT

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Date:   Wed, 2 Mar 2022 16:01:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>, mingo@...hat.com,
        shuah@...nel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 09/13] selftests/ftrace: Do not trace
 do_softirq because of PREEMPT_RT

On Thu, Feb 24, 2022 at 11:46:22PM +0100, Pavel Machek wrote:
>On Tue 2022-02-22 21:31:48, Sasha Levin wrote:
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>>
>> [ Upstream commit 6fec1ab67f8d60704cc7de64abcfd389ab131542 ]
>>
>> 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.
>
>This needs -rt patch even on mainline, right?
>
>It is certainly not needed in -stable branches.

I'll drop it, thanks.

-- 
Thanks,
Sasha