engines/io_uring: add verbose error for ENOSYS
authorJens Axboe <axboe@kernel.dk>
Tue, 16 Feb 2021 19:07:14 +0000 (12:07 -0700)
committerJens Axboe <axboe@kernel.dk>
Tue, 16 Feb 2021 19:07:14 +0000 (12:07 -0700)
If we get ENOSYS for setting up the rings, then the kernel is too old
to support io_uring. Mention that explicitly.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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