WARNING: line length of 83 exceeds 80 columns
#27: FILE: include/net/tcp.h:2433:
+static inline void tcp_warn_once(const struct sock *sk, bool cond, const char *str)

WARNING: quoted string split across lines
#31: FILE: include/net/tcp.h:2437:
+		  "%s"
+		  "out:%u sacked:%u lost:%u retrans:%u "

WARNING: break quoted strings at a space character
#31: FILE: include/net/tcp.h:2437:
+		  "%s"
+		  "out:%u sacked:%u lost:%u retrans:%u "

WARNING: quoted string split across lines
#32: FILE: include/net/tcp.h:2438:
+		  "out:%u sacked:%u lost:%u retrans:%u "
+		  "tlp_high_seq:%u sk_state:%u ca_state:%u "

WARNING: quoted string split across lines
#33: FILE: include/net/tcp.h:2439:
+		  "tlp_high_seq:%u sk_state:%u ca_state:%u "
+		  "advmss:%u mss_cache:%u pmtu:%u\n",

total: 0 errors, 5 warnings, 0 checks, 40 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 a46f2b838810 ("tcp: add a common helper to debug the underlying issue") 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, 5 warnings, 0 checks, 40 lines checked