==========
checkpatch - FAILED

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
#86: FILE: net/xfrm/xfrm_iptfs.c:280:
+		BUG_ON(skb_headlen(skb) > initial_offset);

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
#105: FILE: net/xfrm/xfrm_iptfs.c:299:
+	BUG_ON(initial_offset != 0);

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
#111: FILE: net/xfrm/xfrm_iptfs.c:305:
+	BUG_ON(offset < walk->initial_offset);

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
#119: FILE: net/xfrm/xfrm_iptfs.c:313:
+		BUG_ON(walk->fragi == 0);

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
#192: FILE: net/xfrm/xfrm_iptfs.c:386:
+	BUG_ON(skb->pp_recycle != walk->pp_recycle);

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
#198: FILE: net/xfrm/xfrm_iptfs.c:392:
+	BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);

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
#212: FILE: net/xfrm/xfrm_iptfs.c:406:
+		BUG_ON(shinfo->nr_frags > MAX_SKB_FRAGS);

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
#321: FILE: net/xfrm/xfrm_iptfs.c:870:
+		BUG_ON(leftover != 0);

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
#324: FILE: net/xfrm/xfrm_iptfs.c:873:
+		BUG_ON(skb_tailroom(newskb) < copylen);

ERROR: do not use assignment in if condition
#373: FILE: net/xfrm/xfrm_iptfs.c:1144:
+			if (!fragwalk ||

total: 1 errors, 9 warnings, 0 checks, 360 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 74fae7c03e85 ("xfrm: iptfs: add skb-fragment sharing code") 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.