Warnings before patch:
files: ['tools/testing/selftests/bpf/cgroup_helpers.c', 'tools/testing/selftests/bpf/cgroup_helpers.h']
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:121 No description found for return value of 'enable_controllers'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:162 No description found for return value of 'write_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:183 No description found for return value of 'write_cgroup_file_parent'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:200 No description found for return value of 'setup_cgroup_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:286 No description found for return value of 'join_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:301 No description found for return value of 'join_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:314 No description found for return value of 'join_parent_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:334 No description found for return value of 'set_cgroup_xattr'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:384 No description found for return value of 'get_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:445 No description found for return value of 'create_and_get_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:473 No description found for return value of 'get_cgroup_id_from_path'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:561 No description found for return value of 'setup_classid_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:615 No description found for return value of 'set_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:649 No description found for return value of 'join_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:677 No description found for return value of 'get_classid_cgroup_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:691 No description found for return value of 'get_cgroup1_hierarchy_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:745 No description found for return value of 'open_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:121 No description found for return value of 'enable_controllers'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:162 No description found for return value of 'write_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:183 No description found for return value of 'write_cgroup_file_parent'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:200 No description found for return value of 'setup_cgroup_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:286 No description found for return value of 'join_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:301 No description found for return value of 'join_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:314 No description found for return value of 'join_parent_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:334 No description found for return value of 'set_cgroup_xattr'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:384 No description found for return value of 'get_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:445 No description found for return value of 'create_and_get_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:473 No description found for return value of 'get_cgroup_id_from_path'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:561 No description found for return value of 'setup_classid_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:615 No description found for return value of 'set_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:649 No description found for return value of 'join_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:677 No description found for return value of 'get_classid_cgroup_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:691 No description found for return value of 'get_cgroup1_hierarchy_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:745 No description found for return value of 'open_classid'

Current warnings:
files: ['tools/testing/selftests/bpf/cgroup_helpers.c', 'tools/testing/selftests/bpf/cgroup_helpers.h']
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:121 No description found for return value of 'enable_controllers'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:166 No description found for return value of 'read_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:207 No description found for return value of 'write_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:228 No description found for return value of 'write_cgroup_file_parent'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:245 No description found for return value of 'setup_cgroup_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:331 No description found for return value of 'join_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:346 No description found for return value of 'join_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:359 No description found for return value of 'join_parent_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:379 No description found for return value of 'set_cgroup_xattr'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:429 No description found for return value of 'get_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:490 No description found for return value of 'create_and_get_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:518 No description found for return value of 'get_cgroup_id_from_path'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:606 No description found for return value of 'setup_classid_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:660 No description found for return value of 'set_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:694 No description found for return value of 'join_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:722 No description found for return value of 'get_classid_cgroup_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:736 No description found for return value of 'get_cgroup1_hierarchy_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:790 No description found for return value of 'open_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:121 No description found for return value of 'enable_controllers'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:166 No description found for return value of 'read_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:207 No description found for return value of 'write_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:228 No description found for return value of 'write_cgroup_file_parent'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:245 No description found for return value of 'setup_cgroup_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:331 No description found for return value of 'join_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:346 No description found for return value of 'join_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:359 No description found for return value of 'join_parent_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:379 No description found for return value of 'set_cgroup_xattr'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:429 No description found for return value of 'get_root_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:490 No description found for return value of 'create_and_get_cgroup'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:518 No description found for return value of 'get_cgroup_id_from_path'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:606 No description found for return value of 'setup_classid_environment'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:660 No description found for return value of 'set_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:694 No description found for return value of 'join_classid'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:722 No description found for return value of 'get_classid_cgroup_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:736 No description found for return value of 'get_cgroup1_hierarchy_id'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:790 No description found for return value of 'open_classid'

Warnings before: 34 after: 36 (add: 2)

New warnings added:
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:166 No description found for return value of 'read_cgroup_file'
Warning: tools/testing/selftests/bpf/cgroup_helpers.c:166 No description found for return value of 'read_cgroup_file'
Per-file breakdown:
     2 tools/testing/selftests/bpf/cgroup_helpers.c