WARNING: line length of 89 exceeds 80 columns
#32: FILE: kernel/bpf/btf.c:7838:
+	/* check that function is void or returns int, exception cb also requires this */

WARNING: line length of 81 exceeds 80 columns
#37: FILE: kernel/bpf/btf.c:7842:
+	if (!btf_type_is_void(t) && !btf_type_is_int(t) && !btf_is_any_enum(t)) {

WARNING: quoted string split across lines
#43: FILE: kernel/bpf/btf.c:7847:
+			"Global function %s() return value not void or scalar. "
+			"Only those are supported.\n",

WARNING: line length of 81 exceeds 80 columns
#68: FILE: kernel/bpf/verifier.c:459:
+	if (verifier_bug_if(!func_proto, env, "btf_id %u not found", func->type))

WARNING: line length of 81 exceeds 80 columns
#72: FILE: kernel/bpf/verifier.c:463:
+	if (verifier_bug_if(!type, env, "btf_id %u not found", func_proto->type))

WARNING: line length of 81 exceeds 80 columns
#86: FILE: kernel/bpf/verifier.c:10901:
+		/* All non-void global functions return a 64-bit SCALAR_VALUE. */

WARNING: line length of 81 exceeds 80 columns
#95: FILE: kernel/bpf/verifier.c:17813:
+		/* If this is a void global subprog, there is no return value. */

WARNING: line length of 103 exceeds 80 columns
#96: FILE: kernel/bpf/verifier.c:17814:
+		if (subprog_is_global(env, frame->subprogno) && subprog_is_void(env, frame->subprogno))

WARNING: line length of 95 exceeds 80 columns
#110: FILE: tools/testing/selftests/bpf/progs/exceptions_fail.c:54:
+__failure __msg("Global function exception_cb_bad_ret_type() return value not void or scalar.")

total: 0 errors, 9 warnings, 0 checks, 82 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 e36b96955559 ("bpf: Allow void return type for global subprogs") 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, 9 warnings, 0 checks, 82 lines checked