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commit9c7c4bc986upstream. sizeof(struct ublksrv_io_cmd) is 16bytes, which can be held in 64byte SQE, so not necessary to check IO_URING_F_SQE128. With this change, we get chance to save half SQ ring memory. Fixed:71f28f3136("ublk_drv: add io_uring based userspace block driver") Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20230220041413.1524335-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>