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| author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2026-04-20 23:01:35 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2026-04-22 09:26:37 +0900 |
| commit | 132001e9f90e577d002e0ba613205340c579921f (patch) | |
| tree | ff91d10a4be2ff98b361370828380523c2ef71ae | |
| parent | 476c5bbae65c9ab60b61fca9abd72df75a077183 (diff) | |
selftests/ftrace: Add a testcase for fprobe events on module
Add a testcase for fprobe events on module, which unloads a kernel
module on which fprobe events are probing and ensure the ftrace
hash map is cleared correctly.
Link: https://lore.kernel.org/all/177669369564.132053.623527664540176496.stgit@mhiramat.tok.corp.google.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc new file mode 100644 index 000000000000..2915206777b6 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc @@ -0,0 +1,87 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Generic dynamic event - add/remove fprobe events on module +# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]":README enabled_functions + +rmmod trace-events-sample ||: +if ! modprobe trace-events-sample ; then + echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m" + exit_unresolved; +fi +trap "lsmod | grep -q trace_events_sample && rmmod trace-events-sample" EXIT + +echo 0 > events/enable +echo > dynamic_events + +FUNC1='foo_bar*' +FUNC2='vfs_read' + +:;: "Add an event on the test module" ;: +echo "f:test1 $FUNC1" >> dynamic_events +echo 1 > events/fprobes/test1/enable + +:;: "Ensure it is enabled" ;: +funcs=`cat enabled_functions | wc -l` +test $funcs -ne 0 + +:;: "Check the enabled_functions is cleared on unloading" ;: +rmmod trace-events-sample +funcs=`cat enabled_functions | wc -l` +test $funcs -eq 0 + +:;: "Check it is kept clean" ;: +modprobe trace-events-sample +echo 1 > events/fprobes/test1/enable || echo "OK" +funcs=`cat enabled_functions | wc -l` +test $funcs -eq 0 + +:;: "Add another event not on the test module" ;: +echo "f:test2 $FUNC2" >> dynamic_events +echo 1 > events/fprobes/test2/enable + +:;: "Ensure it is enabled" ;: +ofuncs=`cat enabled_functions | wc -l` +test $ofuncs -ne 0 + +:;: "Disable and remove the first event" +echo 0 > events/fprobes/test1/enable +echo "-:fprobes/test1" >> dynamic_events +funcs=`cat enabled_functions | wc -l` +test $ofuncs -eq $funcs + +:;: "Disable and remove other events" ;: +echo 0 > events/fprobes/enable +echo > dynamic_events +funcs=`cat enabled_functions | wc -l` +test $funcs -eq 0 + +rmmod trace-events-sample + +:;: "Add events on kernel and test module" ;: +modprobe trace-events-sample +echo "f:test1 $FUNC1" >> dynamic_events +echo 1 > events/fprobes/test1/enable +echo "f:test2 $FUNC2" >> dynamic_events +echo 1 > events/fprobes/test2/enable +ofuncs=`cat enabled_functions | wc -l` +test $ofuncs -ne 0 + +:;: "Unload module (ftrace entry should be removed)" ;: +rmmod trace-events-sample +funcs=`cat enabled_functions | wc -l` +test $funcs -ne 0 +test $ofuncs -ne $funcs + +:;: "Disable and remove core-kernel fprobe event" ;: +echo 0 > events/fprobes/test2/enable +echo "-:fprobes/test2" >> dynamic_events + +:;: "Ensure ftrace is disabled." ;: +funcs=`cat enabled_functions | wc -l` +test $funcs -eq 0 + +echo 0 > events/fprobes/enable +echo > dynamic_events + +trap "" EXIT +clear_trace |