tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
Extension
.tc
Size
1415 bytes
Lines
81
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Test ftrace direct functions against kprobes
# requires: kprobe_events

rmmod ftrace-direct ||:
if ! modprobe ftrace-direct ; then
  echo "No ftrace-direct sample module - please build with CONFIG_SAMPLE_FTRACE_DIRECT=m"
  exit_unresolved;
fi

echo "Let the module run a little"
sleep 1

grep -q "my_direct_func: waking up" trace

rmmod ftrace-direct

echo 'p:kwake wake_up_process task=$arg1' > kprobe_events

start_direct() {
	echo > trace
	modprobe ftrace-direct
	sleep 1
	grep -q "my_direct_func: waking up" trace
}

stop_direct() {
	rmmod ftrace-direct
}

enable_probe() {
	echo > trace
	echo 1 > events/kprobes/kwake/enable
	sleep 1
	grep -q "kwake:" trace
}

disable_probe() {
	echo 0 > events/kprobes/kwake/enable
}

test_kprobes() {
	# probe -> direct -> no direct > no probe
	enable_probe
	start_direct
	stop_direct
	disable_probe

	# probe -> direct -> no probe > no direct
	enable_probe
	start_direct
	disable_probe
	stop_direct

	# direct -> probe -> no probe > no direct
	start_direct
	enable_probe
	disable_probe
	stop_direct

	# direct -> probe -> no direct > no noprobe
	start_direct
	enable_probe
	stop_direct
	disable_probe
}

test_kprobes

Annotation

Implementation Notes