selftests/ftrace: Convert check_filter_file() with requires list

Since check_filter_file() is basically checking the filter
tracefs file, we can convert it into requires list.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function graph filters with stack tracer
-# requires: stack_trace
+# requires: stack_trace set_ftrace_filter
 
 # Make sure that function graph filtering works, and is not
 # affected by other tracers enabled (like stack tracer)
@@ -11,8 +11,6 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported
 fi
 
-check_filter_file set_ftrace_filter
-
 do_reset() {
     if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
 	    echo 0 > /proc/sys/kernel/stack_tracer_enabled

tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function graph filters
+# requires: set_ftrace_filter
 
 # Make sure that function graph filtering works
 
@@ -9,8 +10,6 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported
 fi
 
-check_filter_file set_ftrace_filter
-
 fail() { # msg
     echo $1
     exit_fail

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function glob filters
+# requires: set_ftrace_filter
 
 # Make sure that function glob matching filter works.
 
@@ -9,8 +10,6 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
-check_filter_file set_ftrace_filter
-
 disable_tracing
 clear_trace
 

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function pid notrace filters
-# requires: set_ftrace_notrace_pid
+# requires: set_ftrace_notrace_pid set_ftrace_filter
 # flags: instance
 
 # Make sure that function pid matching filter with notrace works.
@@ -11,8 +11,6 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
-check_filter_file set_ftrace_filter
-
 do_function_fork=1
 
 if [ ! -f options/function-fork ]; then

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function pid filters
-# requires: set_ftrace_pid
+# requires: set_ftrace_pid set_ftrace_filter
 # flags: instance
 
 # Make sure that function pid matching filter works.
@@ -12,8 +12,6 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
-check_filter_file set_ftrace_filter
-
 do_function_fork=1
 
 if [ ! -f options/function-fork ]; then

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - stacktrace filter command
+# requires: set_ftrace_filter
 # flags: instance
 
-check_filter_file set_ftrace_filter
-
 echo _do_fork:stacktrace >> set_ftrace_filter
 
 grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter

tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc

@@ -3,15 +3,14 @@
 # description: ftrace - test for function event triggers
 # flags: instance
 #
+# The triggers are set within the set_ftrace_filter file
+# requires: set_ftrace_filter
+#
 # Ftrace allows to add triggers to functions, such as enabling or disabling
 # tracing, enabling or disabling trace events, or recording a stack trace
 # within the ring buffer.
 #
 # This test is designed to test event triggers
-#
-
-# The triggers are set within the set_ftrace_filter file
-check_filter_file set_ftrace_filter
 
 do_reset() {
     reset_ftrace_filter

tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function trace on module
-
-check_filter_file set_ftrace_filter
+# requires: set_ftrace_filter
 
 : "mod: allows to filter a non exist function"
 echo 'non_exist_func:mod:non_exist_module' > set_ftrace_filter

tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function profiler with function tracing
-# requires: function_profile_enabled
+# requires: function_profile_enabled set_ftrace_filter
 
 # There was a bug after a rewrite of the ftrace infrastructure that
 # caused the function_profiler not to be able to run with the function
@@ -19,8 +19,6 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported;
 fi
 
-check_filter_file set_ftrace_filter
-
 fail() { # mesg
     echo $1
     exit_fail

tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc

@@ -2,6 +2,9 @@
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - test reading of set_ftrace_filter
 #
+# The triggers are set within the set_ftrace_filter file
+# requires: set_ftrace_filter
+#
 # The set_ftrace_filter file of ftrace is used to list functions as well as
 # triggers (probes) attached to functions. The code to read this file is not
 # straight forward and has had various bugs in the past. This test is designed
@@ -9,9 +12,6 @@
 # file in various ways (cat vs dd).
 #
 
-# The triggers are set within the set_ftrace_filter file
-check_filter_file set_ftrace_filter
-
 fail() { # mesg
     echo $1
     exit_fail

tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - Max stack tracer
-# requires: stack_trace
+# requires: stack_trace stack_trace_filter
 # Test the basic function of max-stack usage tracing
 
-check_filter_file stack_trace_filter
-
 echo > stack_trace_filter
 echo 0 > stack_max_size
 echo 1 > /proc/sys/kernel/stack_tracer_enabled

tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc

@@ -3,6 +3,9 @@
 # description: ftrace - test for function traceon/off triggers
 # flags: instance
 #
+# The triggers are set within the set_ftrace_filter file
+# requires: set_ftrace_filter
+#
 # Ftrace allows to add triggers to functions, such as enabling or disabling
 # tracing, enabling or disabling trace events, or recording a stack trace
 # within the ring buffer.
@@ -10,9 +13,6 @@
 # This test is designed to test enabling and disabling tracing triggers
 #
 
-# The triggers are set within the set_ftrace_filter file
-check_filter_file set_ftrace_filter
-
 fail() { # mesg
     echo $1
     exit_fail

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

-check_filter_file() { # check filter file introduced by dynamic ftrace
-    if [ ! -f "$1" ]; then
-        echo "$1 not found? Is dynamic ftrace not set?"
-        exit_unsupported
-    fi
-}
-
 clear_trace() { # reset trace output
     echo > trace
 }

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event with function tracer
-# requires: kprobe_events
+# requires: kprobe_events stack_trace_filter
 
 grep "function" available_tracers || exit_unsupported # this is configurable
 
-check_filter_file set_ftrace_filter
-
 # prepare
 echo nop > current_tracer
 echo _do_fork > set_ftrace_filter