WARNING: line length of 82 exceeds 80 columns
#185: FILE: tools/testing/selftests/net/mptcp/mptcp_diag.c:291:
+			struct rtattr *sfinfo[MPTCP_SUBFLOW_ATTR_MAX + 1] = { 0 };

WARNING: line length of 87 exceeds 80 columns
#215: FILE: tools/testing/selftests/net/mptcp/mptcp_diag.c:376:
+	ret = sscanf(subflow_addrs, "%[^:]:%d %[^:]:%d", saddr, &sport, daddr, &dport);

WARNING: Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90
#251: FILE: tools/testing/selftests/net/mptcp/mptcp_diag.c:411:
+			strncpy(p->subflow_addrs, optarg,

total: 0 errors, 3 warnings, 0 checks, 221 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 8b0dc24ae12f ("selftests: mptcp: add helpers to get subflow_info") 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, 3 warnings, 0 checks, 221 lines checked