Fails to compile on Linux Kernel 6.11.1 due to removed DRM functions

[caesrcd]

After updating the Linux kernel on my Arch system from version 6.10.10 to 6.11.1, DKMS attempted to recompile the ms912x module but encountered an error. When I tried to manually recompile it, I observed errors related to the removal of drm_do_get_edid and drm_fbdev_generic_setup functions.

Diffstat v6.10.10 -> v6.11.1
include/drm/drm_edid.h
include/drm/drm_fbdev_generic.h

These functions were removed starting from Linux kernel version 6.11.1, causing the compilation to fail. I would like to know if there is a solution or patch available to make the module compatible with the newer kernel version.

[rhgndf]

I have updated this in the latest commit.

[caesrcd]

I tried to compile with your latest update... without success.

[ms912x]$ make all -j
make CHECK="/usr/bin/sparse" -C /lib/modules/6.11.3-arch1-1/build M=/home/caesrcd/repo/ms912x modules
make[1]: Entering directory '/usr/lib/modules/6.11.3-arch1-1/build'

  CC [M]  /home/caesrcd/repo/ms912x/ms912x_registers.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_connector.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_transfer.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_drv.o
../../../../../home/caesrcd/repo/ms912x/ms912x_connector.c: In function ‘ms912x_connector_get_modes’:
../../../../../home/caesrcd/repo/ms912x/ms912x_connector.c:30:14: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   30 |         edid = drm_edid_read_custom(connector, ms912x_read_edid, ms912x);
      |              ^
../../../../../home/caesrcd/repo/ms912x/ms912x_drv.c:145:1: warning: no previous prototype for ‘ms912x_pipe_mode_valid’ [-Wmissing-prototypes]
  145 | ms912x_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
      | ^~~~~~~~~~~~~~~~~~~~~~
../../../../../home/caesrcd/repo/ms912x/ms912x_drv.c:155:5: warning: no previous prototype for ‘ms912x_pipe_check’ [-Wmissing-prototypes]
  155 | int ms912x_pipe_check(struct drm_simple_display_pipe *pipe,
      |     ^~~~~~~~~~~~~~~~~
../../../../../home/caesrcd/repo/ms912x/ms912x_transfer.c: In function ‘ms912x_free_request’:
../../../../../home/caesrcd/repo/ms912x/ms912x_transfer.c:39:9: error: implicit declaration of function ‘vfree’; did you mean ‘kvfree’? [-Wimplicit-function-declaration]
   39 |         vfree(request->transfer_buffer);
      |         ^~~~~
      |         kvfree
../../../../../home/caesrcd/repo/ms912x/ms912x_transfer.c: In function ‘ms912x_init_request’:
../../../../../home/caesrcd/repo/ms912x/ms912x_transfer.c:53:16: error: implicit declaration of function ‘vmalloc_32’; did you mean ‘kvmalloc’? [-Wimplicit-function-declaration]
   53 |         data = vmalloc_32(len);
      |                ^~~~~~~~~~
      |                kvmalloc
../../../../../home/caesrcd/repo/ms912x/ms912x_transfer.c:53:14: error: assignment to ‘void *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   53 |         data = vmalloc_32(len);
      |              ^
make[3]: *** [scripts/Makefile.build:244: /home/caesrcd/repo/ms912x/ms912x_transfer.o] Error 1
make[2]: *** [/usr/lib/modules/6.11.3-arch1-1/build/Makefile:1926: /home/caesrcd/repo/ms912x] Error 2
make[1]: *** [Makefile:224: __sub-make] Error 2
make[1]: Leaving directory '/usr/lib/modules/6.11.3-arch1-1/build'

make: *** [Makefile:15: modules] Error 2
[ble: exit 2]
[ms912x]$ uname -r
6.11.3-arch1-1
[ms912x]$ git log HEAD -n 4 --oneline
2b34181 (HEAD -> main, origin/main, origin/HEAD) Fix edid update
758acc5 Kernel 6.11 support
738aef1 (origin/kernel-6.10) Add support for USB 3 devices
97bced1 Create LICENSE for possible upstreaming

[rhgndf]

It should compile now on the latest commit.

[caesrcd]

Now compiled on the latest commit.

[repo]$ git clone https://github.com/rhgndf/ms912x.git
Cloning into 'ms912x'...
remote: Enumerating objects: 143, done.
remote: Counting objects: 100% (71/71), done.
remote: Compressing objects: 100% (25/25), done.
remote: Total 143 (delta 57), reused 53 (delta 46), pack-reused 72 (from 1)
Receiving objects: 100% (143/143), 49.28 KiB | 3.28 MiB/s, done.
Resolving deltas: 100% (86/86), done.
[repo]$ cd ms912x/
[ms912x]$ make all -j $(nproc)
make CHECK="/usr/bin/sparse" -C /lib/modules/6.11.4-arch1-1/build M=/home/caesrcd/repo/ms912x modules
make[1]: Entering directory '/usr/lib/modules/6.11.4-arch1-1/build'

  CC [M]  /home/caesrcd/repo/ms912x/ms912x_registers.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_connector.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_transfer.o
  CC [M]  /home/caesrcd/repo/ms912x/ms912x_drv.o
../../../../../home/caesrcd/repo/ms912x/ms912x_drv.c:145:1: warning: no previous prototype for ‘ms912x_pipe_mode_valid’ [-Wmissing-prototypes]
  145 | ms912x_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
      | ^~~~~~~~~~~~~~~~~~~~~~
../../../../../home/caesrcd/repo/ms912x/ms912x_drv.c:155:5: warning: no previous prototype for ‘ms912x_pipe_check’ [-Wmissing-prototypes]
  155 | int ms912x_pipe_check(struct drm_simple_display_pipe *pipe,
      |     ^~~~~~~~~~~~~~~~~
  LD [M]  /home/caesrcd/repo/ms912x/ms912x.o
  MODPOST /home/caesrcd/repo/ms912x/Module.symvers
  CC [M]  /home/caesrcd/repo/ms912x/ms912x.mod.o
  LD [M]  /home/caesrcd/repo/ms912x/ms912x.ko
  BTF [M] /home/caesrcd/repo/ms912x/ms912x.ko
make[1]: Leaving directory '/usr/lib/modules/6.11.4-arch1-1/build'

However, the built module is not loaded:

[ms912x]$ sudo insmod ms912x.ko 
insmod: ERROR: could not insert module ms912x.ko: Unknown symbol in module
[ms912x]$ journalctl -e | grep ms912x
out 23 19:43:09 archlinux kernel: ms912x: Unknown symbol drm_fbdev_ttm_setup (err -2)