linux-kernel - Re: Can't build in the virtio console driver on x86_64 when the other virtio drivers are modular

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Message-ID: <20110225121320.2f540f12@katamari>
Date:	Fri, 25 Feb 2011 12:13:20 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: Can't build in the virtio console driver on x86_64 when the
 other virtio drivers are modular

On Fri, 25 Feb 2011 11:38:15 +0530
Amit Shah <amit.shah@...hat.com> wrote:

> On (Thu) 24 Feb 2011 [11:28:19], Chuck Ebbert wrote:
> > The virtio configuration options are inconsistent. According to this,
> > every options that needs virtio will select it:
> > 
> >  # Virtio always gets selected by whoever wants it.
> >  config VIRTIO
> >         tristate
> > 
> > Note that it's not user-selectable, so any config file that tries to
> > set it will be ignored when kconfig loads those options. And yet we
> > have a whole set of options that depend on VIRTIO, like VIRTIO_CONSOLE
> > for example. This makes it impossible to have VIRTIO_PCI modular and
> > VIRTIO_CONSOLE built-in on x86_64, because:
> 
> Any reason to have VIRTIO_PCI modular instead of built in (on x86-64,
> virtio-console won't work without virtio-pci anyway)?
> 

None that I know of offhand, other than not building in things unless
absolutely necessary. There's no dependency of any kind there, so it's
even possible to build a kernel with VIRTIO_CONSOLE enabled and
VIRTIO_PCI completely disabled.
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