WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#22: 
new file mode 100644

CHECK: Alignment should match open parenthesis
#41: FILE: tools/testing/selftests/bpf/prog_tests/tc_change_tail.c:15:
+	DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook, .ifindex = LO_IFINDEX,
+			.attach_point = BPF_TC_INGRESS);

WARNING: line length of 90 exceeds 80 columns
#123: FILE: tools/testing/selftests/bpf/progs/test_tc_change_tail.c:13:
+static __always_inline struct iphdr *parse_ip_header(struct __sk_buff *skb, int *ip_proto)

WARNING: line length of 96 exceeds 80 columns
#152: FILE: tools/testing/selftests/bpf/progs/test_tc_change_tail.c:42:
+static __always_inline struct tcphdr *parse_tcp_header(struct __sk_buff *skb, struct iphdr *iph)

WARNING: line length of 87 exceeds 80 columns
#215: FILE: tools/testing/selftests/bpf/progs/test_tc_change_tail.c:105:
+		change_tail_ret = bpf_skb_change_tail(skb, 65535, 0); /* Should fail */

WARNING: line length of 83 exceeds 80 columns
#218: FILE: tools/testing/selftests/bpf/progs/test_tc_change_tail.c:108:
+		change_tail_ret = bpf_skb_change_tail(skb, 0, 0); /* Should fail */

total: 0 errors, 5 warnings, 1 checks, 192 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 f050f39ed43b ("selftests/bpf: Test bpf_skb_change_tail() in TC ingress") 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, 5 warnings, 1 checks, 192 lines checked