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If many dmabufs are present, reads of the dmabuf iterator can be truncated at PAGE_SIZE or user buffer size boundaries before the fix in "bpf: Fix truncated dmabuf iterator reads". Add a test to confirm truncation does not occur. Signed-off-by: T.J. Mercier <tjmercier@google.com> Link: https://lore.kernel.org/r/20251204000348.1413593-2-tjmercier@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>