WARNING: Missing a blank line after declarations
#121: FILE: tools/bpf/bpftool/prog.c:1136:
+	FILE *file = mode == TRACE_STDOUT ? stdout : stderr;
+	LIBBPF_OPTS(bpf_test_run_opts, opts);

CHECK: multiple assignments should be avoided
#142: FILE: tools/bpf/bpftool/prog.c:1157:
+		skel->bss->written_count = skel->bss->written_size = 0;

WARNING: line length of 107 exceeds 80 columns
#143: FILE: tools/bpf/bpftool/prog.c:1158:
+		ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.bpftool_dump_prog_stream), &opts);

WARNING: line length of 108 exceeds 80 columns
#144: FILE: tools/bpf/bpftool/prog.c:1159:
+		if (ring_buffer__consume_n(ringbuf, skel->bss->written_count) != skel->bss->written_count) {

CHECK: Please don't use multiple blank lines
#157: FILE: tools/bpf/bpftool/prog.c:1172:
+
+

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#207: 
new file mode 100644

WARNING: return of an errno should typically be negative (ie: return -ENOENT)
#242: FILE: tools/bpf/bpftool/skeleton/stream.bpf.c:31:
+		return ENOENT;

WARNING: line length of 88 exceeds 80 columns
#266: FILE: tools/bpf/bpftool/skeleton/stream.bpf.c:55:
+		/* Probe and exit if no more space, probe for twice the typical size. */

total: 0 errors, 6 warnings, 2 checks, 229 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 de4a7d90db90 ("bpftool: Add support for dumping streams") 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, 6 warnings, 2 checks, 229 lines checked