[PATCH] selftests: tracing: Update fprobe selftest for ftrace based fprobe

Masami Hiramatsu (Google)
2025-11-12T13:13:05Z

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Since the ftrace fprobe is both fgraph and ftrace based implemented,
the selftest needs to be updated. This does not count the actual
number of lines, but just check the differences.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
.../ftrace/test.d/dynevent/add_remove_fprobe.tc | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc
index 2506f464811b..47067a5e3cb0 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc
@@ -28,25 +28,21 @@ test -d events/fprobes/myevent1
test -d events/fprobes/myevent2

echo 1 > events/fprobes/myevent1/enable
-# Make sure the event is attached and is the only one
+# Make sure the event is attached.
grep -q $PLACE enabled_functions
cnt=`cat enabled_functions | wc -l`
-if [ $cnt -ne $((ocnt + 1)) ]; then
+if [ $cnt -eq $ocnt ]; then
exit_fail
fi

echo 1 > events/fprobes/myevent2/enable
-# It should till be the only attached function
-cnt=`cat enabled_functions | wc -l`
-if [ $cnt -ne $((ocnt + 1)) ]; then
- exit_fail
-fi
+cnt2=`cat enabled_functions | wc -l`

echo 1 > events/fprobes/myevent3/enable
# If the function is different, the attached function should be increased
grep -q $PLACE2 enabled_functions
cnt=`cat enabled_functions | wc -l`
-if [ $cnt -ne $((ocnt + 2)) ]; then
+if [ $cnt -eq $cnt2 ]; then
exit_fail
fi

@@ -56,12 +52,6 @@ echo "-:myevent2" >> dynamic_events
grep -q myevent1 dynamic_events
! grep -q myevent2 dynamic_events

-# should still have 2 left
-cnt=`cat enabled_functions | wc -l`
-if [ $cnt -ne $((ocnt + 2)) ]; then
- exit_fail
-fi
-
echo 0 > events/fprobes/enable
echo > dynamic_events