[Bug 2091354] Re: evdi-dkms FTBS in Noble with linux-6.11-hwe kernel

[Timo Aaltonen]

Hello Massimiliano, or anyone else affected,

Accepted evdi into noble-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/evdi/1.14.2+dfsg-1ubuntu1.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: evdi (Ubuntu)
       Status: In Progress => Invalid

** Changed in: evdi (Ubuntu Noble)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-noble

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Title:
  evdi-dkms FTBS in Noble with linux-6.11-hwe kernel

Status in evdi package in Ubuntu:
  Invalid
Status in evdi source package in Noble:
  Fix Committed

Bug description:
  [ Impact ]

  evdi-dkms does not compile from source in Noble with kernel 6.11:

  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_platform_drv.c:205:19: error: initialization of ‘void (*)(struct platform_device *)’ from incompatible pointer type ‘int (*)(struct platform_device *)’ [-Werror=incompatible-pointer-types]
    205 |         .remove = evdi_platform_device_remove,
        |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_gem.c: In function ‘evdi_gem_vmap’:
  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_gem.c:319:25: error: implicit declaration of function ‘vmap’; did you mean ‘kmap’? [-Werror=implicit-function-declaration]
    319 |         obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
        |                         ^~~~
        |                         kmap
  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_gem.c:319:23: warning: assignment to ‘void *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    319 |         obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
        |                       ^
  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_gem.c: In function ‘evdi_gem_vunmap’:
  /var/lib/dkms/evdi/1.14.2+dfsg/build/evdi_gem.c:355:17: error: implicit declaration of function ‘vunmap’; did you mean ‘kunmap’? [-Werror=implicit-function-declaration]
    355 |                 vunmap(obj->vmapping);
        |                 ^~~~~~
        |                 kunmap

  [ Test case ]

  Install the latest linux-6.11 kernel on Noble:

  $ sudo add-apt-repository ppa:canonical-kernel-team/ppa
  $ sudo apt update
  $ sudo apt install linux-image-6.11.0-12-generic \
                     linux-modules-6.11.0-12-generic \
                     linux-modules-extra-6.11.0-12-generic \
                     linux-headers-6.11.0-12-generic

  Install evdi-dkms:

  $ sudo apt install evdi-dkms

  Load the module:

  $ sudo modprobe evdi

  The same procedure should be repeated on linux-6.8 to test for
  possible regressions.

  [ Fix ]

  Patch the code to properly support the new linux 6.11 ABI.

  [ Regression potential ]

  The EVDI module can be used to control multiple screens. We may
  experience regressions related to graphics / monitors in systems that
  are using this module, especially with the new kernels >= 6.11.

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