io_uring: allocate io_kiocb upfront
commit 196be95cd5572078be9deb81cbea145fab246029 upstream. Let io_submit_sqes() to allocate io_kiocb before fetching an sqe. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk> Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
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