lkml.org 
[lkml]   [2019]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: Bogus dependency for HW_RANDOM_VIRTIO with oldconfig
On Tue, Dec 10, 2019 at 11:41 PM Alyssa Ross <hi@alyssa.is> wrote:
>
> I'm new here and not sure if I'm contacting the correct people/groups --
> please point me in the right direction if not. I don't know if the
> culprit here is Kconfig, the virtio Kconfig file, the hw_random Kconfig
> file, or some combination of those.
>
> I believe I have discovered an issue with the order in which make
> oldconfig asks for virtio-related options, and would appreciate some
> advice on how to solve it:
>
> HW_RANDOM_VIRTIO=y depends on VIRTIO=y. In my kernel, VIRTIO=y is
> selected by VIRITO_PCI=y, but when make oldconfig prompts for
> HW_RANDOM_VIRTIO, VIRTIO_PCI has not been prompted for yet, and so
> VIRTIO is still set to m.
>
> This means that it's not possible for me to set HW_RANDOM_VIRTIO=y using
> oldconfig without setting an VIRTIO-selecting option I don't need, but
> that is prompted for _before_ HW_RANDOM_VIRTIO. One such option that I
> have identified so far is VOP. It is prompted for before
> HW_RANDOM_VIRTIO, and so if I set VOP=y it is now possible to set
> HW_RANDOM_VIRTIO.
>
> When using menuconfig on a config file generated with oldconfig, that
> does not have HW_RANDOM_VIRTIO enabled, I am able to set HW_RANDOM=y and
> HW_RANDOM_VIRTIO=y, and after saving I can confirm that no other changes
> have been made to the configuration file. This tells me that there's no
> need for a dependency on e.g. VOP, except when using oldconfig.

OK, you are right.

Actually, the oldconfig restarts when it finds a newly-visible option.
For example, when VIRTIO is changed from n to y,
oldconfig restarts the menu and shows a prompt for HW_RANDOM_VIRTIO.

But, this does not happen when VIRTIO is changed from m to y.

> So, I think there is an ordering issue here, and that oldconfig
> should not prompt for HW_RANDOM_VIRTIO until after any option that might
> select VIRTIO=y.
>
> I would be happy to try to submit or test a patch to fix this, but I
> don't know where to go from here.

Perhaps check_conf() could be fixed, though I have not looked into it yet.


--
Best Regards
Masahiro Yamada

\
 
 \ /
  Last update: 2019-12-12 06:32    [W:0.029 / U:2.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site