WARNING: 'an union' may be misspelled - perhaps 'a union'?
#9: 
Use instead full "unsigned long" storage, as an union with sk->sk_stamp
                                             ^^^^^^^^

WARNING: line length of 91 exceeds 80 columns
#104: FILE: include/net/tcp.h:642:
+	ptr = reuse ? &reuse->synq_overflow_ts : &((struct sock *)sk)->sk_synq_overflow_ts;

total: 0 errors, 2 warnings, 0 checks, 113 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 89ce3dcd3ba2 ("tcp: add sk->sk_synq_overflow_ts") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 113 lines checked