WARNING: line length of 82 exceeds 80 columns
#56: FILE: tools/testing/selftests/bpf/prog_tests/mptcp.c:344:
+	SYS(fail, "ip -net %s link add veth1 type veth peer name veth2", NS_TEST);

WARNING: line length of 88 exceeds 80 columns
#61: FILE: tools/testing/selftests/bpf/prog_tests/mptcp.c:349:
+	if (SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags)) {

total: 0 errors, 2 warnings, 0 checks, 144 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 52179703a31c ("selftests/bpf: Add mptcp subflow 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, 0 checks, 144 lines checked