selftests/ftrace: Add a test to probe module functions

#!/bin/sh

# description: Kprobe dynamic event - probing module

[ -f kprobe_events ] || exit_unsupported # this is configurable

disable_events

echo > kprobe_events

:;: "Add an event on a module function without specifying event name" ;:

MOD=`lsmod | head -n 2 | tail -n 1 | cut -f1 -d" "`

FUNC=`grep -m 1 ".* t .*\\[$MOD\\]" /proc/kallsyms | xargs | cut -f3 -d" "`

[ "x" != "x$MOD" -a "y" != "y$FUNC" ] || exit_unresolved

echo "p $MOD:$FUNC" > kprobe_events

PROBE_NAME=`echo $MOD:$FUNC | tr ".:" "_"`

test -d events/kprobes/p_${PROBE_NAME}_0 || exit_failure

:;: "Add an event on a module function with new event name" ;:

echo "p:event1 $MOD:$FUNC" > kprobe_events

test -d events/kprobes/event1 || exit_failure

:;: "Add an event on a module function with new event and group name" ;:

echo "p:kprobes1/event1 $MOD:$FUNC" > kprobe_events

test -d events/kprobes1/event1 || exit_failure

echo > kprobe_events