Re: [PATCH v2 2/2] drivers: gpio: add virtio-gpio guest driver

[Jason Wang]

On 2020/12/8 下午3:02, Enrico Weigelt, metux IT consult wrote:
> On 08.12.20 03:36, Jason Wang wrote:
>
> Hi,
>
> > So we endup with two solutions (without a prompt):
> >
> > 1) using select, user may end up with driver without transport
> IMHO not an entirely unusual situation in other places of the kernel,
> eg. one can enable USB devices, w/o having an usb host adapter enabled.
>
> And even if some USB-HA driver is enabled, the actualy machine doesn't
> necessarily have the corresponding device.


Ok, then select works for me.


> > 2) using depends, user need to enable at least one transport
> >
> > 2) looks a little bit better I admit.
> So, all virtio devices should depend on TRANSPORT_A || TRANSPORT_B ||
> TRANSPORT_C || ... ? (and also change all these places if another
> transport is added) ?


I think not. The idea is, if none of the transport (select VIRTIO) is 
enabled, user can not enable any virtio drivers (depends on VIRTIO).

Thanks


> --mtx