WARNING: line length of 87 exceeds 80 columns
#132: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:96:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.freeze", "1");

CHECK: Blank lines aren't necessary after an open brace '{'
#139: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:103:
+		if (!cgroups[i].target) {
+

WARNING: line length of 90 exceeds 80 columns
#140: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:104:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.subtree_control",

WARNING: line length of 84 exceeds 80 columns
#151: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:115:
+			err = write_cgroup_file(cgroups[i].path, "memory.max", buf);

WARNING: line length of 83 exceeds 80 columns
#156: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:120:
+			write_cgroup_file(cgroups[i].path, "memory.swap.max", buf);

CHECK: Blank lines aren't necessary before a close brace '}'
#158: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:122:
+
+		}

WARNING: line length of 86 exceeds 80 columns
#169: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:133:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.procs", buf);

CHECK: Unnecessary parentheses around 'pid == cgroups[i].pid'
#213: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:177:
+			if (!ASSERT_OK(cgroups[i].victim !=
+				       (pid == cgroups[i].pid),
+				       "correct process was killed")) {

CHECK: Comparison to NULL could be written "!strstr"
#232: FILE: tools/testing/selftests/bpf/prog_tests/test_oom.c:196:
+			if (!ASSERT_OK(strstr(buf, "oom_kill 1") == NULL,

WARNING: line length of 90 exceeds 80 columns
#325: FILE: tools/testing/selftests/bpf/progs/test_oom.c:27:
+int BPF_PROG(test_out_of_memory, struct oom_control *oc, struct bpf_struct_ops_link *link)

WARNING: line length of 88 exceeds 80 columns
#348: FILE: tools/testing/selftests/bpf/progs/test_oom.c:50:
+	bpf_for_each(css, css_pos, &root_memcg->css, BPF_CGROUP_ITER_DESCENDANTS_POST) {

WARNING: line length of 92 exceeds 80 columns
#349: FILE: tools/testing/selftests/bpf/progs/test_oom.c:51:
+		if (css_pos->cgroup->nr_descendants + css_pos->cgroup->nr_dying_descendants)

CHECK: Unnecessary parentheses around 'usage > max_usage'
#364: FILE: tools/testing/selftests/bpf/progs/test_oom.c:66:
+		if ((usage > max_usage) && mem_cgroup_killable(memcg)) {

total: 0 errors, 8 warnings, 5 checks, 367 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 3193e60a2881 ("bpf: selftests: BPF OOM struct ops test") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 8 warnings, 5 checks, 367 lines checked