CHECK: extern prototypes should be avoided in .h files
#32: FILE: tools/testing/selftests/bpf/bpf_experimental.h:595:
+extern int bpf_iter_dmabuf_new(struct bpf_iter_dmabuf *it) __weak __ksym;

WARNING: line length of 86 exceeds 80 columns
#33: FILE: tools/testing/selftests/bpf/bpf_experimental.h:596:
+extern struct dma_buf *bpf_iter_dmabuf_next(struct bpf_iter_dmabuf *it) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#33: FILE: tools/testing/selftests/bpf/bpf_experimental.h:596:
+extern struct dma_buf *bpf_iter_dmabuf_next(struct bpf_iter_dmabuf *it) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#34: FILE: tools/testing/selftests/bpf/bpf_experimental.h:597:
+extern void bpf_iter_dmabuf_destroy(struct bpf_iter_dmabuf *it) __weak __ksym;

WARNING: line length of 86 exceeds 80 columns
#45: FILE: tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c:222:
+static void subtest_dmabuf_iter_check_open_coded(struct dmabuf_iter *skel, int map_fd)

WARNING: line length of 90 exceeds 80 columns
#84: FILE: tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c:261:
+	if (!ASSERT_OK(bpf_map_update_elem(map_fd, udmabuf_test_buffer_name, &f, BPF_ANY),

WARNING: line length of 90 exceeds 80 columns
#87: FILE: tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c:264:
+	if (!ASSERT_OK(bpf_map_update_elem(map_fd, sysheap_test_buffer_name, &f, BPF_ANY),

total: 0 errors, 4 warnings, 3 checks, 129 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 17c3116dd8a0 ("selftests/bpf: Add test for open coded dmabuf_iter") 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, 3 checks, 129 lines checked