Resolve compile errors for Linux Kernel 6.6

[Bidski]

I am getting compile errors for Linux Kernel 6.6. See #433 and NixOS/nixpkgs Issue 265868. This PR applies fixes that I think are correct based on the changes made to Linux Kernel 6.6.

Specifically, the changes made in this patch are

1. drm_gem_prime_fd_to_handle and drm_gem_prime_handle_to_fd are no longer exported as these are the defaults (if I understand correctly), so .prime_fd_to_handle and .prime_handle_to_fd no longer need to be set.
2. FBINFO_DEFAULT is no longer defined as it was defined as 0 and this is the default value (assuming the info struct is zero initialised)

I have done limited testing on my system and it seems to work and the CI build against Linux Kernel 6.6 passes.

[Segaja]

Any idea when this will be merged? Kernel 6.6 has landed on Archlinux and without this fix people can't upgrade to it while using displaylink and evdi

[dominikzogg]

Tested with Fedora 39 (6.6.1-300.fc39.x86_64), seems to work fine so far.

[armistace]

@Segaja

pkgname='evdi-git'
pkgver=bidski_evdi_14
_pkgver="${pkgver%%.r*}"
pkgrel=1
pkgdesc='kernel module that enables management of multiple screens, primarily for DisplayLink USB VGA DVI HDMI DisplayPort video'
arch=('i686' 'x86_64')
url='https://github.com/DisplayLink/evdi'
license=('GPL')
depends=('dkms')
makedepends=('git' 'libdrm')
makedepends+=('linux-headers')
provides=("evdi=${_pkgver}")
conflicts=('evdi')
_srcdir="${pkgname%-git}"
source=(
  'git+https://github.com/Bidski/evdi'
)
source[0]+='#branch=devel'
md5sums=('SKIP')
sha256sums=('SKIP')

pkgver() {
  cd "${_srcdir}"
  local _modver _rev
  #_modver="$(awk -F '=' '/MODVER=/ {print $2}' module/Makefile)"
  _rev="bidski_evdi_14"
  if [ -z "${_modver:-}" ]; then
    printf '%s\n' "${_rev}"
  else
    printf '%s.r%s\n' "${_modver}" "${_rev##*.r}"
  fi
}

prepare() {
  cd "${_srcdir}"
  local _src
  for _src in "${source[@]%%::*}"; do
    _src="${_src##*/}"
    if [[ "${_src}" = *.patch ]]; then
      msg2 "Patch ${_src}"
      patch -Np1 -i "../${_src}"
    fi
  done

  #sed -e 's:-Werror::g' -i 'Makefile'
}

build() {
  cd "${_srcdir}"
  CFLAGS="${CFLAGS/-fno-plt/}"
  CFLAGS="${CFLAGS/-fexceptions/}"
  # DKMS builds are hard to debug. We can build it here to debug the errors.
  #make -j1 -C 'module'
  make -j1 -C 'library'
}

package() {
  cd "${_srcdir}"
  make -C 'library' -j1 install DESTDIR="${pkgdir}" PREFIX='/usr'

if ! :; then
  pushd "${pkgdir}/usr/lib/" > /dev/null
  local _libase
  local _libs=(*.so.*)
  if [ "${#_libs[@]}" -eq 2 ]; then
    _libs="${_libs[1]}"
    for _libase in *.so*; do
      if [ "${_libase}" != "${_libs}" ]; then
        ln -sf "${_libs}" "${_libase}"
      fi
    done
  elif [ "${#_libs[@]}" -eq 1 ]; then
    _libs="${_libs[0]}"
    _libase="${_libs%.so*}.so"
    ln -sf "${_libs}" "${_libase}"
    ln -sf "${_libs}" "${_libase}.0" # bad soname
  else
    echo 'Unhandled libs'
    false
  fi
  popd > /dev/null
fi

  local _DKMS="${pkgdir}/usr/src/${pkgname%-git}-${_pkgver}"
  install -Dpm644 module/* -t "${_DKMS}/"
  make -j1 -C "${_DKMS}" clean
  rm -f "${_DKMS}/evdi.mod"
}

I fiddled with the evdi-git pkg build to pull from bidski's repo if you're after an interim fix seems to largely work

[Segaja]

That looks like a creative PKGBUILD file. I don't even see where you reference the patch. ;)

Do we have any kind of ETA when this fix will be merged?

[synaptics-lspintzyk]

This is good, please squash all 3 commits to one and remove following comment that you can put in git commit message:
// KERNEL_VERSION(6, 6, 0) has removed FBINFO_DEFAULT as it is equal to 0, which is the default value

[Bidski]

@lspintzyk this has now been squashed

[displaylink-emajewsk]

@Bidski Thank you