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

[Krzysztof Kozlowski]

BugLink: https://bugs.launchpad.net/bugs/1959610

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 at canonical.com>
Reviewed-by: Shuah Khan <skhan at linuxfoundation.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Reviewed-by: Steven Rostedt (Google) <rostedt at goodmis.org>
Signed-off-by: Shuah Khan <skhan at linuxfoundation.org>
(cherry picked from commit 6fec1ab67f8d60704cc7de64abcfd389ab131542 linux-next)
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>
---
 .../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..25432b8cd5bd 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="scheduler_tick"
 
 ALL_FUNCS="#### all functions enabled ####"
 
-- 
2.32.0