CHECK: Macro argument 'reg' may be better as '(reg)' to avoid precedence issues
#55: FILE: arch/s390/net/bpf_jit_comp.c:645:
+#define EMIT_JUMP_REG(reg) do {						\
+	if (nospec_uses_trampoline())					\
+		/* brcl 0xf,__s390_indirect_jump_rN */			\
+		EMIT6_PCREL_RILC_PTR(0xc0040000, 0x0f,			\
+				     __s390_indirect_jump_r ## reg);	\
+	else								\
+		/* br %rN */						\
+		_EMIT2(0x07f0 | reg);					\
+} while (0)

total: 0 errors, 0 warnings, 1 checks, 100 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 cc071df2de71 ("s390/bpf: Use kernel's expoline thunks") 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, 0 warnings, 1 checks, 100 lines checked