io_uring: track mm through current->mm
As a preparation for extracting request init bits, remove self-coded mm tracking from io_submit_sqes(), but rely on current->mm. It's more convenient, than passing this piece of state in other functions. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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