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Commit 131f840d authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Steven Rostedt
Browse files

selftests: ftrace: Initialize ftrace before each test 

Reset ftrace to initial state before running each test.
This fixes some test cases to enable tracing before starting
trace test. This can avoid false-positive failure when
previous testcase fails while disabling tracing.

Link: http://lkml.kernel.org/r/147928398192.22982.7767460638302113002.stgit@devbox



Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Suggested-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent fa32e855

tools/testing/selftests/ftrace/ftracetest

+1 −1
Original line number Diff line number Diff line
@@ -228,7 +228,7 @@ trap 'SIG_RESULT=$XFAIL' $SIG_XFAIL 


__run_test() { # testfile

  # setup PID and PPID, $$ is not updated.

  (cd $TRACING_DIR; read PID _ < /proc/self/stat ; set -e; set -x; . $1)

  (cd $TRACING_DIR; read PID _ < /proc/self/stat; set -e; set -x; initialize_ftrace; . $1)

  [ $? -ne 0 ] && kill -s $SIG_FAIL $SIG_PID

}

tools/testing/selftests/ftrace/test.d/functions

+28 −0
Original line number Diff line number Diff line
@@ -23,3 +23,31 @@ reset_trigger() { # reset all current setting triggers 
    done

}



reset_events_filter() { # reset all current setting filters

    grep -v ^none events/*/*/filter |

    while read line; do

	echo 0 > `echo $line | cut -f1 -d:`

    done

}



disable_events() {

    echo 0 > events/enable

}



initialize_ftrace() { # Reset ftrace to initial-state

# As the initial state, ftrace will be set to nop tracer,

# no events, no triggers, no filters, no function filters,

# no probes, and tracing on.

    disable_tracing

    reset_tracer

    reset_trigger

    reset_events_filter

    disable_events

    echo > set_event_pid	# event tracer is always on

    [ -f set_ftrace_filter ] && echo | tee set_ftrace_*

    [ -f set_graph_function ] && echo | tee set_graph_*

    [ -f stack_trace_filter ] && echo > stack_trace_filter

    [ -f kprobe_events ] && echo > kprobe_events

    [ -f uprobe_events ] && echo > uprobe_events

    enable_tracing

}