io_uring: add likely/unlikely in io_get_sqring()
The number of SQEs to submit is specified by a user, so io_get_sqring() in most of the cases succeeds. Hint compilers about that. Checking ASM genereted by gcc 9.2.0 for x64, there is one branch misprediction. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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