WARNING: line length of 81 exceeds 80 columns
#38: FILE: tools/testing/selftests/bpf/bpf_experimental.h:95:
+ *	0 on success, -EINVAL if head is NULL, prev is not in the list with head,

WARNING: line length of 83 exceeds 80 columns
#41: FILE: tools/testing/selftests/bpf/bpf_experimental.h:98:
+extern int bpf_list_add_impl(struct bpf_list_head *head, struct bpf_list_node *new,

CHECK: extern prototypes should be avoided in .h files
#41: FILE: tools/testing/selftests/bpf/bpf_experimental.h:98:
+extern int bpf_list_add_impl(struct bpf_list_head *head, struct bpf_list_node *new,

WARNING: line length of 87 exceeds 80 columns
#42: FILE: tools/testing/selftests/bpf/bpf_experimental.h:99:
+			     struct bpf_list_node *prev, void *meta, __u64 off) __ksym;

WARNING: line length of 81 exceeds 80 columns
#45: FILE: tools/testing/selftests/bpf/bpf_experimental.h:102:
+#define bpf_list_add(head, new, prev) bpf_list_add_impl(head, new, prev, NULL, 0)

WARNING: line length of 81 exceeds 80 columns
#247: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:559:
+__description("list_add_test2: list_add accepts list_front return value as prev")

WARNING: line length of 81 exceeds 80 columns
#299: FILE: tools/testing/selftests/bpf/progs/refcounted_kptr.c:611:
+__description("list_push_back_uninit_head: push_back on 0-initialized list head")

total: 0 errors, 6 warnings, 1 checks, 339 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 f354f99f0c3f ("selftests/bpf: Add test cases for bpf_list_del/add/is_first/is_last/empty") 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, 6 warnings, 1 checks, 339 lines checked