[PATCH] selftests: cpu-hotplug: check hotplug dir for the CONFIG_HOTPLUG_CPU

[Po-Hsu Lin]

When the CONFIG_HOTPLUG_CPU is not set, there won't be a "hotplug"
directory in /sys/devices/system/cpu/. Make use of this fact to check
if we need to skip this test.

Signed-off-by: Po-Hsu Lin <po-hsu....@canonical.com>
---
 tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh 
b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
index 0d26b5e..27275a1 100755
--- a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
+++ b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
@@ -23,6 +23,11 @@ prerequisite()
                exit $ksft_skip
        fi
 
+       if [ ! -d $SYSFS/devices/system/cpu/hotplug/ ]; then
+               echo $msg CONFIG_HOTPLUG_CPU needs to be enabled >&2
+               exit $ksft_skip
+       fi
+
        if ! ls $SYSFS/devices/system/cpu/cpu* > /dev/null 2>&1; then
                echo $msg cpu hotplug is not supported >&2
                exit $ksft_skip
-- 
2.7.4