Re: Polling on an io_uring file descriptor

[Pavel Begunkov <asml.silence@gmail.com>]

On 10/22/21 08:59, Drew DeVault wrote:
> On Wed Oct 20, 2021 at 2:00 PM CEST, Drew DeVault wrote:
>>> Surely should be updated if not mentioned
>>
>> That, or the constraint removed? The reasoning is a bit obscure and I
>> suspect that this case could be made possible.
> 
> So I dug into this a bit more, and the constraint seems to be to avoid a
> reference loop when CONFIG_UNIX=n. I grepped Google and SourceGraph for
> "CONFIG_UNIX=n" and only found two kernel configs with Unix sockets
> disabled, neither of which had io_uring enabled. Given the rather
> arbitrary restriction on registering io_urings with each other, and the
> apparent absence of a use-case for io_uring without Unix sockets, can we
> just require CONFIG_UNIX for io_uring and remove the limitation?

It's potentially problematic, even now we have a couple of other
spots relying on it. Is there a good reason why it's needed?

-- 
Pavel Begunkov