WARNING: line length of 87 exceeds 80 columns
#64: FILE: tools/testing/selftests/net/mptcp/mptcp_join.sh:1676:
+		fail_test "got $count JOIN[s] synack with Backup expected $mpj_syn_ack"

total: 0 errors, 1 warnings, 0 checks, 114 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 2c59aa8244bf ("selftests: mptcp: join: validate backup in MPJ") 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, 1 warnings, 0 checks, 114 lines checked