selftest/cgroup: Add new test cases to test_cpuset_prs.sh

Add new test cases to test_cpuset_prs.sh to cover corner cases reported
in previous fix commits.

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

Author: Waiman-Long

tools/testing/selftests/cgroup/test_cpuset_prs.sh

@@ -321,7 +321,7 @@ TEST_MATRIX=(
 	#  old-A1 old-A2 old-A3 old-B1 new-A1 new-A2 new-A3 new-B1 fail ECPUs Pstate ISOLCPUS
 	#  ------ ------ ------ ------ ------ ------ ------ ------ ---- ----- ------ --------
 	#
-	# Incorrect change to cpuset.cpus invalidates partition root
+	# Incorrect change to cpuset.cpus[.exclusive] invalidates partition root
 	#
 	# Adding CPUs to partition root that are not in parent's
 	# cpuset.cpus is allowed, but those extra CPUs are ignored.
@@ -365,6 +365,16 @@ TEST_MATRIX=(
 	# cpuset.cpus can overlap with sibling cpuset.cpus.exclusive but not subsumed by it
 	"   C0-3     .      .    C4-5     X5     .      .      .     0 A1:0-3,B1:4-5"
 
+	# Child partition root that try to take all CPUs from parent partition
+	# with tasks will remain invalid.
+	" C1-4:P1:S+ P1     .      .       .     .      .      .     0 A1:1-4,A2:1-4 A1:P1,A2:P-1"
+	" C1-4:P1:S+ P1     .      .       .   C1-4     .      .     0 A1,A2:1-4 A1:P1,A2:P1"
+	" C1-4:P1:S+ P1     .      .       T   C1-4     .      .     0 A1:1-4,A2:1-4 A1:P1,A2:P-1"
+
+	# Clearing of cpuset.cpus with a preset cpuset.cpus.exclusive shouldn't
+	# affect cpuset.cpus.exclusive.effective.
+	" C1-4:X3:S+ C1:X3  .      .       .     C      .      .     0 A2:1-4,XA2:3"
+
 	#  old-A1 old-A2 old-A3 old-B1 new-A1 new-A2 new-A3 new-B1 fail ECPUs Pstate ISOLCPUS
 	#  ------ ------ ------ ------ ------ ------ ------ ------ ---- ----- ------ --------
 	# Failure cases: