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bug#52667: System reconfiguration fails to build linux-modules.drv


From: Tobias Geerinckx-Rice
Subject: bug#52667: System reconfiguration fails to build linux-modules.drv
Date: Tue, 21 Dec 2021 23:38:44 +0100

Vivien,

Thanks for the report! Sorry it took me a while to get back to you.

As discussed in #guix, an immediate work-around is:

 (initrd-modules
   ;; This cannot be built as a module for linux-libre-lts.
   ((@ (srfi srfi-1) delete) "simplefb" %base-initrd-modules))

I'm not sure what to do going forward. I see two reasonable solutions. Perhaps there are more, and I welcome suggestions.

One is to provide a separate %base-initrd-modules-lts list that's equivalent to the snippet above. It's… not great, but then linux-libre-lts itself isn't documented and people still seem to find it. If someone were to document it, they could also add a note about modules.

A more straightforward route is to simply build in simplefb even for kernels 5.15 and beyond. Apart from an (unmeasured) size increase of the base image, the main drawback here is that we lose our long-standing CONFIG_DRM_SIMPLEDRM=m due to a conflict:

- CONFIG_DRM_GEM_SHMEM_HELPER=y
- CONFIG_DRM_SIMPLEDRM=m
+ # CONFIG_DRM_SIMPLEDRM unset tristate: Simple framebuffer driver
- CONFIG_FB_SIMPLE=m
+ CONFIG_FB_SIMPLE=y tristate: Simple framebuffer support

When preparing <https://issues.guix.gnu.org/51619> I considered this a regression and hence bad, but maybe nobody cares…?

Kind regards,

T G-R

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