WARNING: line length of 87 exceeds 80 columns
#66: FILE: tools/bpf/bpftool/prog.c:714:
+prog_dump_stream(struct bpf_prog_info *info, enum dump_mode mode, const char *filepath)

WARNING: Missing a blank line after declarations
#69: FILE: tools/bpf/bpftool/prog.c:717:
+	FILE *file = mode == DUMP_STDOUT ? stdout : stderr;
+	LIBBPF_OPTS(bpf_test_run_opts, opts);

CHECK: multiple assignments should be avoided
#91: FILE: tools/bpf/bpftool/prog.c:739:
+		skel->bss->written_count = skel->bss->written_size = 0;

WARNING: line length of 107 exceeds 80 columns
#92: FILE: tools/bpf/bpftool/prog.c:740:
+		ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.bpftool_dump_prog_stream), &opts);

WARNING: line length of 106 exceeds 80 columns
#94: FILE: tools/bpf/bpftool/prog.c:742:
+		if (ring_buffer__consume_n(ringbuf, skel->bss->written_count) != skel->bss->written_count)

WARNING: line length of 90 exceeds 80 columns
#133: FILE: tools/bpf/bpftool/prog.c:959:
+		p_err("expected 'stdout', 'stderr', 'xlated' or 'jited', got: %s", *argv);

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#162: 
new file mode 100644

CHECK: spaces preferred around that '*' (ctx:WxV)
#179: FILE: tools/bpf/bpftool/skeleton/stream.bpf.c:13:
+	struct bpf_stream_elem_batch __kptr *batch;
 	                                    ^

WARNING: return of an errno should typically be negative (ie: return -ENOENT)
#210: FILE: tools/bpf/bpftool/skeleton/stream.bpf.c:44:
+		return ENOENT;

WARNING: line length of 87 exceeds 80 columns
#243: FILE: tools/bpf/bpftool/skeleton/stream.bpf.c:77:
+		/* Probe and exit if no more space, probe for twice the typical size.*/

total: 0 errors, 8 warnings, 2 checks, 224 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 820d4e72814e ("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, 8 warnings, 2 checks, 224 lines checked