CHECK: Please use a blank line after function/struct/union/enum declarations
#36: FILE: tools/lib/bpf/libbpf.h:1789:
 };
+#define bpf_linker_opts__last_field filename

CHECK: Please use a blank line after function/struct/union/enum declarations
#44: FILE: tools/lib/bpf/libbpf.h:1796:
 };
+#define bpf_linker_file_opts__last_field filename

WARNING: line length of 87 exceeds 80 columns
#49: FILE: tools/lib/bpf/libbpf.h:1801:
+LIBBPF_API struct bpf_linker *bpf_linker__new_fd(int fd, struct bpf_linker_opts *opts);

WARNING: line length of 81 exceeds 80 columns
#152: FILE: tools/lib/bpf/linker.c:296:
+		snprintf(linker->filename, LINKER_MAX_FD_NAME_SIZE, "fd:%d", fd);

WARNING: line length of 82 exceeds 80 columns
#246: FILE: tools/lib/bpf/linker.c:576:
+		pr_warn("failed to create memfd '%s': %s\n", name, errstr(errno));

WARNING: line length of 83 exceeds 80 columns
#254: FILE: tools/lib/bpf/linker.c:584:
+			pr_warn("failed to write '%s': %s\n", name, errstr(errno));

total: 0 errors, 4 warnings, 2 checks, 237 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 cd8d6b03f53e ("libbpf: Extend linker API to support in-memory ELF files") 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, 4 warnings, 2 checks, 237 lines checked