selftests/sysctl: Fix to load test_sysctl module

Fix to load test_sysctl.ko module correctly.

sysctl.sh checks whether the test module is embedded (or loaded
already) or not at first, and if not, it returns skip error
instead of trying modprobe. Thus, there is no chance to load the
test_sysctl test module.

Instead, this removes that module embedded check and returns
skip error only if it ensures that there is no embedded test
module *and* no loadable test module.

This also avoid referring config file since that is not
installed.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/sysctl/sysctl.sh

@@ -40,16 +40,6 @@ ALL_TESTS="$ALL_TESTS 0004:1:1:uint_0001"
 ALL_TESTS="$ALL_TESTS 0005:3:1:int_0003"
 ALL_TESTS="$ALL_TESTS 0006:50:1:bitmap_0001"
 
-test_modprobe()
-{
-       if [ ! -d $DIR ]; then
-               echo "$0: $DIR not present" >&2
-               echo "You must have the following enabled in your kernel:" >&2
-               cat $TEST_DIR/config >&2
-               exit $ksft_skip
-       fi
-}
-
 function allow_user_defaults()
 {
 	if [ -z $DIR ]; then
@@ -125,10 +115,12 @@ function load_req_mod()
 	if [ ! -d $DIR ]; then
 		if ! modprobe -q -n $TEST_DRIVER; then
 			echo "$0: module $TEST_DRIVER not found [SKIP]"
+			echo "You must set CONFIG_TEST_SYSCTL=m in your kernel" >&2
 			exit $ksft_skip
 		fi
 		modprobe $TEST_DRIVER
 		if [ $? -ne 0 ]; then
+			echo "$0: modprobe $TEST_DRIVER failed."
 			exit
 		fi
 	fi
@@ -929,7 +921,6 @@ test_reqs
 allow_user_defaults
 check_production_sysctl_writes_strict
 load_req_mod
-test_modprobe
 
 trap "test_finish" EXIT