WARNING: line length of 90 exceeds 80 columns
#322: FILE: include/net/tcp.h:2439:
+		u64 rto_time_stamp_us = tcp_skb_timestamp_us(skb) + jiffies_to_usecs(rto);

WARNING: else is not generally useful after a break or return
#325: FILE: include/net/tcp.h:2442:
+		return rto_time_stamp_us - tcp_sk(sk)->tcp_mstamp;
+	} else {

CHECK: Alignment should match open parenthesis
#327: FILE: include/net/tcp.h:2444:
+		WARN_ONCE(1,
+			"rtx queue emtpy: "

WARNING: quoted string split across lines
#328: FILE: include/net/tcp.h:2445:
+			"rtx queue emtpy: "
+			"out:%u sacked:%u lost:%u retrans:%u "

WARNING: quoted string split across lines
#329: FILE: include/net/tcp.h:2446:
+			"out:%u sacked:%u lost:%u retrans:%u "
+			"tlp_high_seq:%u sk_state:%u ca_state:%u "

WARNING: quoted string split across lines
#330: FILE: include/net/tcp.h:2447:
+			"tlp_high_seq:%u sk_state:%u ca_state:%u "
+			"advmss:%u mss_cache:%u pmtu:%u\n",

total: 0 errors, 5 warnings, 1 checks, 28 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 a80fd522c6f6 ("tcp: check skb is non-NULL in tcp_rto_delta_us()") 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, 1 checks, 28 lines checked