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Currently, uffd_register.range.len is set to 4096 for command 'ioctl(uffd, UFFDIO_REGISTER, &uffd_register)'. For arm64 64KB page size, the len must be 64KB size aligned as page size alignment is required. See fs/userfaultfd.c:validate_unaligned_range(). Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20250607013615.1551783-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>