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由 Dylan Yudaken 提交于
When using BUFFER_SELECT there is no technical requirement that the user actually provides iov, and this removes one copy_from_user call. So allow iov_len to be 0. Signed-off-by: NDylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220630091231.1456789-4-dylany@fb.comSigned-off-by: NJens Axboe <axboe@kernel.dk>
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