CHECK: Macro argument 'len' may be better as '(len)' to avoid precedence issues
#82: FILE: tools/testing/selftests/bpf/progs/test_tc_tunnel.c:26:
+#define BPF_F_ADJ_ROOM_ENCAP_L2(len)			\
+	(((__u64)len & BPF_ADJ_ROOM_ENCAP_L2_MASK)	\
+	 << BPF_ADJ_ROOM_ENCAP_L2_SHIFT)

CHECK: spaces preferred around that '<<' (ctx:VxV)
#97: FILE: tools/testing/selftests/bpf/progs/test_tc_tunnel.c:39:
+#define	VXLAN_FLAGS     bpf_htonl(1<<27)
        	                           ^

total: 0 errors, 0 warnings, 2 checks, 127 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 887f0f183e90 ("selftests/bpf: make test_tc_tunnel.bpf.c compatible with big endian platforms") 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, 0 warnings, 2 checks, 127 lines checked