kselftest/cgroup: Add cpuset v2 partition root state test

Add a test script test_cpuset_prs.sh with a helper program wait_inotify
for exercising the cpuset v2 partition root state code.

Signed-off-by: Waiman Long <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>

Author: Waiman-Long

tools/testing/selftests/cgroup/.gitignore

@@ -5,3 +5,4 @@ test_freezer
 test_kmem
 test_kill
 test_cpu
+wait_inotify

tools/testing/selftests/cgroup/Makefile

@@ -1,10 +1,11 @@
 # SPDX-License-Identifier: GPL-2.0
 CFLAGS += -Wall -pthread
 
-all:
+all: ${HELPER_PROGS}
 
 TEST_FILES     := with_stress.sh
-TEST_PROGS     := test_stress.sh
+TEST_PROGS     := test_stress.sh test_cpuset_prs.sh
+TEST_GEN_FILES := wait_inotify
 TEST_GEN_PROGS = test_memcontrol
 TEST_GEN_PROGS += test_kmem
 TEST_GEN_PROGS += test_core