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    Subject[PATCH v2 12/32] selftests/ftrace: Improve kprobe on module testcase to load/unload module
    Date
    Improve kprobe events on module testcase to check module
    load/unload with disabled/enabled events. This also change
    the target module to trace_printk.ko, so it depends on
    CONFIG_SAMPLE_TRACE_PRINTK=m.

    Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
    ---
    tools/testing/selftests/ftrace/config | 4 ++
    .../ftrace/test.d/kprobe/kprobe_module.tc | 35 ++++++++++++++++++--
    2 files changed, 36 insertions(+), 3 deletions(-)

    diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config
    index 07db5ab09cc7..32cf61b6bb54 100644
    --- a/tools/testing/selftests/ftrace/config
    +++ b/tools/testing/selftests/ftrace/config
    @@ -7,3 +7,7 @@ CONFIG_HIST_TRIGGERS=y
    CONFIG_PREEMPT_TRACER=y
    CONFIG_IRQSOFF_TRACER=y
    CONFIG_PREEMPTIRQ_DELAY_TEST=m
    +CONFIG_MODULES=y
    +CONFIG_MODULE_UNLOAD=y
    +CONFIG_SAMPLES=y
    +CONFIG_SAMPLE_TRACE_PRINTK=m
    diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_module.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_module.tc
    index ec6c5fffef1e..1efe9e616bc4 100644
    --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_module.tc
    +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_module.tc
    @@ -4,11 +4,18 @@

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

    +rmmod trace-printk ||:
    +if ! modprobe trace-printk.ko ; then
    + echo "No trace-printk sample module - please make CONFIG_SAMPLE_TRACE_PRINTK=
    +m"
    + exit_unresolved;
    +fi
    +
    +MOD=trace_printk
    +FUNC=trace_printk_irq_work
    +
    :;: "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
    @@ -22,3 +29,25 @@ test -d events/kprobes/event1 || exit_failure

    echo "p:kprobes1/event1 $MOD:$FUNC" > kprobe_events
    test -d events/kprobes1/event1 || exit_failure
    +
    +:;: "Remove target module, but event still be there" ;:
    +if ! rmmod trace-printk ; then
    + echo "Failed to unload module - please enable CONFIG_MODULE_UNLOAD"
    + exit_unresolved;
    +fi
    +test -d events/kprobes1/event1
    +
    +:;: "Check posibility to defining events on unloaded module";:
    +echo "p:event2 $MOD:$FUNC" >> kprobe_events
    +
    +:;: "Target is gone, but we can prepare for next time";:
    +echo 1 > events/kprobes1/event1/enable
    +
    +:;: "Load module again, which means the event1 should be recorded";:
    +modprobe trace-printk.ko
    +grep "event1:" trace
    +
    +:;: "Remove the module again and check the event is not locked"
    +rmmod trace-printk
    +echo 0 > events/kprobes1/event1/enable
    +echo "-:kprobes1/event1" >> kprobe_events
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