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

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Message-ID: <176295318112.431538.11780280333728368327.stgit@devnote2>
Date: Wed, 12 Nov 2025 22:13:01 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Heiko Carstens <hca@...ux.ibm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH] selftests: tracing: Update fprobe selftest for ftrace based fprobe

From: Masami Hiramatsu (Google) <mhiramat@...nel.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@...nel.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