selftests/ftrace: Convert required interface checks into requires list

#!/bin/sh

# description: Snapshot and tracing setting

# requires: snapshot

# flags: instance

[ ! -f snapshot ] && exit_unsupported

echo "Set tracing off"

echo 0 > tracing_on

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: trace_pipe and trace_marker

# requires: trace_marker

# flags: instance

[ ! -f trace_marker ] && exit_unsupported

echo "test input 1" > trace_marker

: "trace interface never consume the ring buffer"

#!/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

  exit_unresolved;

fi

if [ ! -f kprobe_events ]; then

	echo "No kprobe_events file -please build CONFIG_KPROBE_EVENTS"

	exit_unsupported;

fi

echo "Let the module run a little"

sleep 1

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Generic dynamic event - add/remove kprobe events

[ -f dynamic_events ] || exit_unsupported

# requires: dynamic_events

grep -q "place: \[<module>:\]<symbol>" README || exit_unsupported

grep -q "place (kretprobe): \[<module>:\]<symbol>" README || exit_unsupported

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Generic dynamic event - add/remove synthetic events

[ -f dynamic_events ] || exit_unsupported

# requires: dynamic_events

grep -q "s:\[synthetic/\]" README || exit_unsupported