Re: [PATCH AUTOSEL 4.19 09/13] selftests/ftrace: Do not trace do_softirq because of PREEMPT_RT

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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@xxxxxxxxxxxxx>

[ 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



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