[LTP] [PATCH 16/16] controllers: update cgroup_regression_test to use newer cgroup lib

[Luke Nowakowski-Krijger]

The older function in the cgroup lib 'get_cgroup_mountpoint' has been
removed, so instead replace it with its old functionaility to get
mountpoint.

Also use the newer cgroup lib require operation to mount and cleanup a
cpu controller.

Signed-off-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger@canonical.com>
---
 .../cgroup/cgroup_regression_test.sh            | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
index 592a1d3b1..2df216f43 100755
--- a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
+++ b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
@@ -170,17 +170,8 @@ test3()
 		return
 	fi
 
-	cpu_subsys_path=$(get_cgroup_mountpoint "cpu")
-
-	# Run the test for 30 secs
-	if [ -z "$cpu_subsys_path" ]; then
-		mount -t cgroup -o cpu xxx cgroup/
-		if [ $? -ne 0 ]; then
-			tst_res TFAIL "Failed to mount cpu subsys"
-			return
-		fi
-		cpu_subsys_path=cgroup
-	fi
+	cgroup_require "cpu"
+	cpu_subsys_path=$(cgroup_get_mountpoint "cpu")
 
 	cgroup_regression_3_1.sh $cpu_subsys_path &
 	pid1=$!
@@ -193,7 +184,7 @@ test3()
 	wait $pid2 2>/dev/null
 
 	rmdir $cpu_subsys_path/0 2> /dev/null
-	tst_umount $PWD/cgroup
+	cgroup_cleanup
 	check_kernel_bug
 }
 
@@ -310,7 +301,7 @@ test_7_1()
 	# could be passed here as params and this will lead to ambiguity and
 	# errors when grepping simply for 'debug' in /proc/mounts since we'll
 	# find also /sys/kernel/debug. Helper takes care of this.
-	local subsys_path=$(get_cgroup_mountpoint $subsys)
+	local subsys_path=$(grep cgroup /proc/mounts | grep -w $subsys | awk '{ print $2 }')
 
 	if [ -z "$subsys_path" ]; then
 		mount -t cgroup -o $subsys xxx cgroup/
-- 
2.32.0