WARNING: line length of 81 exceeds 80 columns
#72: FILE: net/xfrm/xfrm_iptfs.c:115:
+ * arranges for `skb->data - 16` (etherhdr space) to be the start of a cacheline.

WARNING: line length of 83 exceeds 80 columns
#73: FILE: net/xfrm/xfrm_iptfs.c:116:
+ * Otherwise, @l3resv is true and resv is either the size of headroom from `tpl` or

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#261: FILE: net/xfrm/xfrm_iptfs.c:469:
+	BUG_ON(skb->len <= mtu);

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#398: FILE: net/xfrm/xfrm_iptfs.c:606:
+	BUG_ON(skb_is_gso(skb));

WARNING: line length of 82 exceeds 80 columns
#517: FILE: net/xfrm/xfrm_iptfs.c:1000:
+		return x->outer_mode.family == AF_INET ? IP_MAX_MTU : IP6_MAX_MTU;

total: 0 errors, 5 warnings, 0 checks, 520 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 bb36c73c44a7 ("xfrm: iptfs: add fragmenting of larger than MTU user packets") 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, 520 lines checked