WARNING: line length of 82 exceeds 80 columns
#38: FILE: tools/lib/bpf/elf.c:40:
+		pr_warn("elf: failed to open %s: %s\n", binary_path, errstr(ret));

WARNING: line length of 81 exceeds 80 columns
#143: FILE: tools/lib/bpf/linker.c:564:
+		pr_warn("failed to open file '%s': %s\n", filename, errstr(err));

WARNING: line length of 83 exceeds 80 columns
#189: FILE: tools/lib/bpf/linker.c:2805:
+		pr_warn("failed to write out .BTF ELF section: %s\n", errstr(err));

WARNING: line length of 95 exceeds 80 columns
#198: FILE: tools/lib/bpf/linker.c:2817:
+			pr_warn("failed to write out .BTF.ext ELF section: %s\n", errstr(err));

WARNING: line length of 82 exceeds 80 columns
#207: FILE: tools/lib/bpf/linker.c:2993:
+		pr_warn("failed to parse final .BTF.ext data: %s\n", errstr(err));

WARNING: line length of 87 exceeds 80 columns
#272: FILE: tools/lib/bpf/ringbuf.c:209:
+		pr_warn("ringbuf: failed to create epoll instance: %s\n", errstr(err));

WARNING: line length of 98 exceeds 80 columns
#313: FILE: tools/lib/bpf/ringbuf.c:511:
+		pr_warn("user ringbuf: failed to epoll add map fd=%d: %s\n", map_fd, errstr(err));

WARNING: line length of 92 exceeds 80 columns
#322: FILE: tools/lib/bpf/ringbuf.c:536:
+		pr_warn("user ringbuf: failed to create epoll instance: %s\n", errstr(err));

WARNING: line length of 86 exceeds 80 columns
#388: FILE: tools/lib/bpf/usdt.c:1053:
+				spec_id, usdt_provider, usdt_name, path, errstr(err));

WARNING: line length of 88 exceeds 80 columns
#411: FILE: tools/lib/bpf/usdt.c:1082:
+					i, usdt_provider, usdt_name, path, errstr(err));

total: 0 errors, 10 warnings, 0 checks, 344 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 a4123a87c1c6 ("libbpf: stringify errno in log messages in the remaining code") 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, 10 warnings, 0 checks, 344 lines checked