selftests/ftrace: Add wakeup_rt tracer testcase

#!/bin/sh

# SPDX-License-Identifier: GPL2.0

# description: Test wakeup RT tracer

if ! which chrt ; then

  echo "chrt is not found. This test requires chrt command."

  exit_unresolved

fi

if ! grep -wq "wakeup_rt" available_tracers ; then

  echo "wakeup_rt tracer is not supported"

  exit_unsupported

fi

echo wakeup_rt > current_tracer

echo 1 > tracing_on

echo 0 > tracing_max_latency

: "Wakeup a realtime task"

chrt -f 5 sleep 1

echo 0 > tracing_on

grep "+ \[[[:digit:]]*\]" trace

grep "==> \[[[:digit:]]*\]" trace