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
#83: FILE: kernel/bpf/verifier.c:10874:
+		/* All non-void global functions return a 64-bit SCALAR_VALUE. */

WARNING: suspect code indent for conditional statements (8, 24)
#133: FILE: kernel/bpf/verifier.c:18063:
+	if (subprog_is_global(env, cur_frame->subprogno) &&
[...]
+			return 0;

WARNING: line length of 82 exceeds 80 columns
#153: FILE: kernel/bpf/verifier.c:24572:
+				verbose(env, "exception cb cannot return void\n");

WARNING: line length of 89 exceeds 80 columns
#158: FILE: kernel/bpf/verifier.c:24577:
+			/* Also ensure the callback only has a single scalar argument. */

WARNING: line length of 95 exceeds 80 columns
#171: 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, 8 warnings, 0 checks, 144 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 fa4d90db4dca ("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, 8 warnings, 0 checks, 144 lines checked