selftests: cgroup: Lexicographic order in Makefile

This will reduce number of conflicts when modifying the lists.
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

tools/testing/selftests/cgroup/.gitignore

 # SPDX-License-Identifier: GPL-2.0-only
-test_memcontrol
 test_core
-test_freezer
-test_kmem
-test_kill
 test_cpu
 test_cpuset
-test_zswap
+test_freezer
 test_hugetlb_memcg
+test_kill
+test_kmem
+test_memcontrol
+test_zswap
 wait_inotify

tools/testing/selftests/cgroup/Makefile

@@ -6,26 +6,27 @@ all: ${HELPER_PROGS}
 TEST_FILES     := with_stress.sh
 TEST_PROGS     := test_stress.sh test_cpuset_prs.sh test_cpuset_v1_hp.sh
 TEST_GEN_FILES := wait_inotify
-TEST_GEN_PROGS = test_memcontrol
-TEST_GEN_PROGS += test_kmem
-TEST_GEN_PROGS += test_core
-TEST_GEN_PROGS += test_freezer
-TEST_GEN_PROGS += test_kill
+# Keep the lists lexicographically sorted
+TEST_GEN_PROGS  = test_core
 TEST_GEN_PROGS += test_cpu
 TEST_GEN_PROGS += test_cpuset
-TEST_GEN_PROGS += test_zswap
+TEST_GEN_PROGS += test_freezer
 TEST_GEN_PROGS += test_hugetlb_memcg
+TEST_GEN_PROGS += test_kill
+TEST_GEN_PROGS += test_kmem
+TEST_GEN_PROGS += test_memcontrol
+TEST_GEN_PROGS += test_zswap
 
 LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
 
 include ../lib.mk
 
-$(OUTPUT)/test_memcontrol: cgroup_util.c
-$(OUTPUT)/test_kmem: cgroup_util.c
 $(OUTPUT)/test_core: cgroup_util.c
-$(OUTPUT)/test_freezer: cgroup_util.c
-$(OUTPUT)/test_kill: cgroup_util.c
 $(OUTPUT)/test_cpu: cgroup_util.c
 $(OUTPUT)/test_cpuset: cgroup_util.c
-$(OUTPUT)/test_zswap: cgroup_util.c
+$(OUTPUT)/test_freezer: cgroup_util.c
 $(OUTPUT)/test_hugetlb_memcg: cgroup_util.c
+$(OUTPUT)/test_kill: cgroup_util.c
+$(OUTPUT)/test_kmem: cgroup_util.c
+$(OUTPUT)/test_memcontrol: cgroup_util.c
+$(OUTPUT)/test_zswap: cgroup_util.c