CHECK: extern prototypes should be avoided in .h files
#57: FILE: tools/testing/selftests/bpf/bpf_experimental.h:579:
+extern int bpf_iter_mptcp_subflow_new(struct bpf_iter_mptcp_subflow *it,

WARNING: line length of 89 exceeds 80 columns
#135: FILE: tools/testing/selftests/bpf/prog_tests/mptcp.c:529:
+	skel->links.iters_subflow = bpf_program__attach_cgroup(skel->progs.iters_subflow,

CHECK: extern prototypes should be avoided in .h files
#179: FILE: tools/testing/selftests/bpf/progs/mptcp_bpf.h:43:
+extern struct mptcp_sock *bpf_mptcp_sock_acquire(struct mptcp_sock *msk) __ksym;

CHECK: extern prototypes should be avoided in .h files
#180: FILE: tools/testing/selftests/bpf/progs/mptcp_bpf.h:44:
+extern void bpf_mptcp_sock_release(struct mptcp_sock *msk) __ksym;

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#189: 
new file mode 100644

total: 0 errors, 2 warnings, 3 checks, 185 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 d679f1e3c48d ("selftests/bpf: Add mptcp_subflow bpf_iter subtest") 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, 2 warnings, 3 checks, 185 lines checked