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

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Date:   Wed, 9 Dec 2020 17:31:41 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        linux-kernel@...r.kernel.org, corbet@....net,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        linux-doc@...r.kernel.org, linux-gpio@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-riscv@...ts.infradead.org, stefanha@...hat.com,
        msuchanek@...e.de
Subject: Re: [PATCH v2 2/2] drivers: gpio: add virtio-gpio guest driver


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
>