selftests/ftrace: Add "requires:" list support

Introduce "requires:" list to check required ftrace interface
for each test. This will simplify the interface checking code
and unify the error message. Another good point is, it can
skip the ftrace initializing.

Note that this requires list must be written as a shell
comment.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index d3f6652311ef..cdf7940b6610 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -267,6 +267,11 @@ testcase() { # testfile
   prlog -n "[$CASENO]$INSTANCE$desc"
 }
 
+checkreq() { # testfile
+  requires=`grep "^#[ \t]*requires:" $1 | cut -f2- -d:`
+  check_requires $requires
+}
+
 test_on_instance() { # testfile
   grep -q "^#[ \t]*flags:.*instance" $1
 }
@@ -356,7 +361,8 @@ trap 'SIG_RESULT=$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; initialize_ftrace; . $1)
+  (cd $TRACING_DIR; read PID _ < /proc/self/stat; set -e; set -x;
+   checkreq $1; initialize_ftrace; . $1)
   [ $? -ne 0 ] && kill -s $SIG_FAIL $SIG_PID
 }