io_uring: add mapping support for NOMMU archs
That is a bit weird scenario but I find it interesting to run fio loads using LKL linux, where MMU is disabled. Probably other real archs which run uClinux can also benefit from this patch. Signed-off-by: NRoman Penyaev <rpenyaev@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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