Re: [PATCH] selftests/ftrace: Do not trace do_softirq because of PREEMPT_RT

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On 2/9/22 9:24 AM, Krzysztof Kozlowski wrote:
The PREEMPT_RT patchset does not use soft IRQs thus trying to filter for
do_softirq fails for such kernel:

   echo do_softirq
   ftracetest: 81: echo: echo: I/O error

Choose some other externally visible function for the test.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>

---

I understand that the failure does not exist on mainline kernel (only
with PREEMPT_RT patchset) but the change does not harm it.

If it is not suitable alone, please consider it for RT patchset.
---
  .../selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc      | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 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
index e96e279e0533..1d0c7601865f 100644
--- 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
FILTER=set_ftrace_filter
  FUNC1="schedule"
-FUNC2="do_softirq"
+FUNC2="_printk"
ALL_FUNCS="#### all functions enabled ####"

Change looks good to me.

Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>

thanks,
-- Shuah




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