WARNING: line length of 82 exceeds 80 columns
#111: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:81:
+		/* Freeze the top-level cgroup and enable the memory controller */

WARNING: line length of 87 exceeds 80 columns
#113: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:83:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.freeze", "1");

WARNING: line length of 90 exceeds 80 columns
#117: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:87:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.subtree_control",

WARNING: line length of 85 exceeds 80 columns
#128: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:98:
+			err = write_cgroup_file(cgroups[i].path, "memory.high", buf);

WARNING: line length of 83 exceeds 80 columns
#133: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:103:
+			write_cgroup_file(cgroups[i].path, "memory.swap.max", buf);

WARNING: line length of 86 exceeds 80 columns
#145: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:115:
+			err = write_cgroup_file(cgroups[i].path, "cgroup.procs", buf);

CHECK: Unnecessary parentheses around 'pid == cgroups[i].pid'
#186: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:156:
+			if (!ASSERT_OK(cgroups[i].victim !=
+				       (pid == cgroups[i].pid),
+				       "correct process was killed")) {

WARNING: line length of 81 exceeds 80 columns
#197: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:167:
+			size = read_cgroup_file(cgroups[i].path, "memory.events",

CHECK: Comparison to NULL could be written "!strstr"
#204: FILE: tools/testing/selftests/bpf/prog_tests/test_psi.c:174:
+			if (!ASSERT_OK(strstr(buf, "oom_kill 1") == NULL,

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#262: FILE: tools/testing/selftests/bpf/progs/test_psi.c:1:
+#include "vmlinux.h"

WARNING: externs should be avoided in .c files
#277: FILE: tools/testing/selftests/bpf/progs/test_psi.c:16:
+extern struct task_struct *bpf_task_from_pid(s32 pid) __ksym;

total: 0 errors, 9 warnings, 2 checks, 315 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 ba18b86b18f0 ("bpf: selftests: PSI 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, 9 warnings, 2 checks, 315 lines checked