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

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[ 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

[ 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.

** Affects: evdi (Ubuntu)
     Importance: Undecided
     Assignee: Massimiliano Pellizzer (mpellizzer)
         Status: In Progress

** Affects: evdi (Ubuntu Noble)
     Importance: Undecided
         Status: In Progress


** Tags: patch
-- 
evdi-dkms FTBS in Noble with linux-6.11-hwe kernel
https://bugs.launchpad.net/bugs/2091354
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