WARNING: line length of 89 exceeds 80 columns
#27: FILE: kernel/bpf/btf.c:7839:
+	/* check that function is void or returns int, exception cb also requires this */

WARNING: line length of 81 exceeds 80 columns
#32: FILE: kernel/bpf/btf.c:7843:
+	if (!btf_type_is_void(t) && !btf_type_is_int(t) && !btf_is_any_enum(t)) {

WARNING: quoted string split across lines
#38: FILE: kernel/bpf/btf.c:7848:
+			"Global function %s() return value not void or scalar. "
+			"Only those are supported.\n",

WARNING: line length of 81 exceeds 80 columns
#63: FILE: kernel/bpf/verifier.c:460:
+	if (verifier_bug_if(!func_proto, env, "btf_id %u not found", func->type))

WARNING: line length of 81 exceeds 80 columns
#67: FILE: kernel/bpf/verifier.c:464:
+	if (verifier_bug_if(!type, env, "btf_id %u not found", func_proto->type))

WARNING: line length of 81 exceeds 80 columns
#83: FILE: kernel/bpf/verifier.c:10866:
+		/* All non-void global functions return a 64-bit SCALAR_VALUE. */

CHECK: Blank lines aren't necessary after an open brace '{'
#95: FILE: kernel/bpf/verifier.c:17840:
 	if (!is_subprog || frame->in_exception_callback_fn) {
+

WARNING: line length of 104 exceeds 80 columns
#102: FILE: kernel/bpf/verifier.c:17847:
+		if (env->prog->type == BPF_PROG_TYPE_EXT && subprog_returns_void(env, frame->subprogno))

WARNING: line length of 81 exceeds 80 columns
#113: FILE: kernel/bpf/verifier.c:17880:
+		/* If this is a void global subprog, there is no return value. */

WARNING: line length of 108 exceeds 80 columns
#114: FILE: kernel/bpf/verifier.c:17881:
+		if (subprog_is_global(env, frame->subprogno) && subprog_returns_void(env, frame->subprogno))

WARNING: line length of 82 exceeds 80 columns
#132: FILE: kernel/bpf/verifier.c:24508:
+				verbose(env, "exception cb cannot return void\n");

WARNING: line length of 89 exceeds 80 columns
#137: FILE: kernel/bpf/verifier.c:24513:
+			/* Also ensure the callback only has a single scalar argument. */

WARNING: line length of 95 exceeds 80 columns
#150: 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, 12 warnings, 1 checks, 125 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 d0856657e737 ("bpf: Allow void global functions in the verifier") 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, 12 warnings, 1 checks, 125 lines checked