[Bug 2091499] Re: librem-ec-acpi-dkms FTBS in Noble with linux-6.11-hwe kernel

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** Tags added: patch

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https://bugs.launchpad.net/bugs/2091499

Title:
  librem-ec-acpi-dkms FTBS in Noble with linux-6.11-hwe kernel

Status in librem-ec-acpi package in Ubuntu:
  In Progress
Status in librem-ec-acpi source package in Noble:
  In Progress

Bug description:
  [ Impact ]

  librem-ec-acpi-dkms does not compile from source in Noble with kernel
  6.11:

  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:782:10: error: ‘struct acpi_driver’ has no member named ‘owner’
    782 |         .owner = THIS_MODULE,
        |          ^~~~~
  In file included from ./arch/x86/include/asm/mem_encrypt.h:15,
                   from ./include/linux/mem_encrypt.h:17,
                   from ./arch/x86/include/asm/processor-flags.h:6,
                   from ./arch/x86/include/asm/irqflags.h:5,
                   from ./include/linux/irqflags.h:18,
                   from ./include/linux/spinlock.h:59,
                   from ./include/linux/mmzone.h:8,
                   from ./include/linux/gfp.h:7,
                   from ./include/linux/slab.h:16,
                   from ./include/linux/resource_ext.h:11,
                   from ./include/linux/acpi.h:13,
                   from /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:16:
  ./include/linux/init.h:180:21: warning: initialization of ‘char’ from ‘struct module *’ makes integer from pointer without a cast [-Wint-conversion]
    180 | #define THIS_MODULE (&__this_module)
        |                     ^
  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:782:18: note: in expansion of macro ‘THIS_MODULE’
    782 |         .owner = THIS_MODULE,
        |                  ^~~~~~~~~~~
  ./include/linux/init.h:180:21: note: (near initialization for ‘librem_ec_driver.class[0]’)
    180 | #define THIS_MODULE (&__this_module)
        |                     ^
  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:782:18: note: in expansion of macro ‘THIS_MODULE’
    782 |         .owner = THIS_MODULE,
        |                  ^~~~~~~~~~~
  ./include/linux/init.h:180:21: error: initializer element is not computable at load time
    180 | #define THIS_MODULE (&__this_module)
        |                     ^
  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:782:18: note: in expansion of macro ‘THIS_MODULE’
    782 |         .owner = THIS_MODULE,
        |                  ^~~~~~~~~~~
  ./include/linux/init.h:180:21: note: (near initialization for ‘librem_ec_driver.class[0]’)
    180 | #define THIS_MODULE (&__this_module)
        |                     ^
  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:782:18: note: in expansion of macro ‘THIS_MODULE’
    782 |         .owner = THIS_MODULE,
        |                  ^~~~~~~~~~~
  /var/lib/dkms/librem_ec_acpi/0.9.2/build/librem_ec_acpi.c:780:46: warning: missing braces around initializer [-Wmissing-braces]
    780 | static struct acpi_driver librem_ec_driver = {
        |    

  [ 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 librem-ec-acpi-dkms:

  $ sudo apt install librem-ec-acpi-dkms

  Load the module:

  $ sudo modprobe librem-ec-acpi

  [ Fix ]

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

  [ Regression potential ]

  A regression is unlikely due to the limited scope of the patch.

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