WARNING: line length of 83 exceeds 80 columns
#48: FILE: tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c:105:
+	prog = bpf_object__find_program_by_name(skel->obj, "test_cgrp_from_id_ns");

WARNING: line length of 96 exceeds 80 columns
#83: FILE: tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c:140:
+		if (!ASSERT_EQ(write(pipe_fd[1], &ret, sizeof(ret)), sizeof(ret), "write pipe"))

WARNING: line length of 93 exceeds 80 columns
#94: FILE: tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c:151:
+		if (!ASSERT_EQ(read(pipe_fd[0], &res, sizeof(res)), sizeof(res), "read res"))

total: 0 errors, 3 warnings, 0 checks, 109 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit b4952975aa71 ("selftests/bpf: Add a test for bpf_cgroup_from_id lookup in non-root cgns") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 3 warnings, 0 checks, 109 lines checked