linux-kernel - [PATCH v2 6/7] selftests: tracing: Enable fprobe events before checking enable

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Message-ID: <174343538009.843280.6583146613234713007.stgit@devnote2>
Date: Tue,  1 Apr 2025 00:36:20 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2 6/7] selftests: tracing: Enable fprobe events before checking enable_functions

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

Since the fprobe is not registered before enabling the fprobe events,
enable_functions is also empty before enabling it. Thus the tests
which checking enable_functions must ensure the event is enabled before
testing the enable_functions.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 .../ftrace/test.d/dynevent/add_remove_fprobe.tc    |   30 +++++++++++++-------
 1 file changed, 19 insertions(+), 11 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 73f6c6fcecab..2506f464811b 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
@@ -16,6 +16,18 @@ ocnt=`cat enabled_functions | wc -l`
 
 echo "f:myevent1 $PLACE" >> dynamic_events
 
+echo "f:myevent2 $PLACE%return" >> dynamic_events
+
+# add another event
+echo "f:myevent3 $PLACE2" >> dynamic_events
+
+grep -q myevent1 dynamic_events
+grep -q myevent2 dynamic_events
+grep -q myevent3 dynamic_events
+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
 grep -q $PLACE enabled_functions
 cnt=`cat enabled_functions | wc -l`
@@ -23,29 +35,22 @@ if [ $cnt -ne $((ocnt + 1)) ]; then
 	exit_fail
 fi
 
-echo "f:myevent2 $PLACE%return" >> dynamic_events
-
+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
 
-# add another event
-echo "f:myevent3 $PLACE2" >> dynamic_events
-
+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
 	exit_fail
 fi
 
-grep -q myevent1 dynamic_events
-grep -q myevent2 dynamic_events
-grep -q myevent3 dynamic_events
-test -d events/fprobes/myevent1
-test -d events/fprobes/myevent2
-
+echo 0 > events/fprobes/myevent2/enable
 echo "-:myevent2" >> dynamic_events
 
 grep -q myevent1 dynamic_events
@@ -57,6 +62,7 @@ if [ $cnt -ne $((ocnt + 2)) ]; then
 	exit_fail
 fi
 
+echo 0 > events/fprobes/enable
 echo > dynamic_events
 
 # Should have none left
@@ -67,12 +73,14 @@ fi
 
 echo "f:myevent4 $PLACE" >> dynamic_events
 
+echo 1 > events/fprobes/myevent4/enable
 # Should only have one enabled
 cnt=`cat enabled_functions | wc -l`
 if [ $cnt -ne $((ocnt + 1)) ]; then
 	exit_fail
 fi
 
+echo 0 > events/fprobes/enable
 echo > dynamic_events
 
 # Should have none left