WARNING: line length of 89 exceeds 80 columns
#89: FILE: tools/testing/selftests/net/txtimestamp.c:634:
+			msg.msg_controllen = cfg_use_cmsg * CMSG_SPACE(sizeof(uint32_t));

WARNING: line length of 97 exceeds 80 columns
#90: FILE: tools/testing/selftests/net/txtimestamp.c:635:
+			msg.msg_controllen += cfg_use_cmsg_opt_id * CMSG_SPACE(sizeof(uint32_t));

WARNING: line length of 92 exceeds 80 columns
#106: FILE: tools/testing/selftests/net/txtimestamp.c:647:
+				cmsg = cmsg ? CMSG_NXTHDR(&msg, cmsg) : CMSG_FIRSTHDR(&msg);

WARNING: line length of 90 exceeds 80 columns
#152: FILE: tools/testing/selftests/net/txtimestamp.c:829:
+		error(1, 0, "control message TS_OPT_ID can only be used with udp socket");

total: 0 errors, 4 warnings, 0 checks, 138 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 9600ea7d4722 ("selftests: txtimestamp: add SCM_TS_OPT_ID test") 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, 4 warnings, 0 checks, 138 lines checked