WARNING: Missing a blank line after declarations
#43: FILE: tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c:55:
+	u64 *values;
+	LIBBPF_OPTS(bpf_test_run_opts, opts,

WARNING: line length of 81 exceeds 80 columns
#67: FILE: tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c:79:
+	err = bpf_map__update_elem(map, &key, sizeof(key), values, values_sz, 0);

WARNING: line length of 81 exceeds 80 columns
#78: FILE: tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c:90:
+	err = bpf_map__update_elem(map, &key, sizeof(key), values, values_sz, 0);

CHECK: No space is necessary after a cast
#106: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:577:
+	bpf_probe_read_kernel(&refcount, sizeof(refcount), (void *) ref);

WARNING: line length of 83 exceeds 80 columns
#110: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:581:
+static int __insert_in_list(struct bpf_list_head *head, struct bpf_spin_lock *lock,

CHECK: spaces preferred around that '*' (ctx:WxO)
#111: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:582:
+			    struct node_data __kptr **node)
 			                            ^

CHECK: No space is necessary after a cast
#129: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:600:
+	ref = (u64)(void *) &m->ref;

total: 0 errors, 4 warnings, 3 checks, 124 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 65a26e43f757 ("selftests/bpf: Add test to verify freeing the special fields when update [lru_,]percpu_hash maps") 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, 4 warnings, 3 checks, 124 lines checked