Arch Linux User Repository

This package have several variables to enable/disable features.

##
## The following variables can be customized at build time. Use env or export to change at your wish
##
##   Example: env _microarchitecture=98 use_numa=n use_tracers=n makepkg -sc
##
## Look inside 'choose-gcc-optimization.sh' to choose your microarchitecture
## Valid numbers between: 0 to 99
## Default is: 0 => generic
## Good option if your package is for one machine: 98 (Intel native) or 99 (AMD native)
if [ -z ${_microarchitecture+x} ]; then
  _microarchitecture=0
fi

## Disable NUMA since most users do not have multiple processors. Breaks CUDA/NvEnc.
## Archlinux and Xanmod enable it by default.
## Set variable "use_numa" to: n to disable (possibly increase performance)
##                             y to enable  (stock default)
if [ -z ${use_numa+x} ]; then
  use_numa=y
fi

## Since upstream disabled CONFIG_STACK_TRACER (limits debugging and analyzing of the kernel)
## you can enable them setting this option. Caution, because they have an impact in performance.
## Stock Archlinux has this enabled. 
## Set variable "use_tracers" to: n to disable (possibly increase performance, XanMod default)
##                                y to enable  (Archlinux default)
if [ -z ${use_tracers+x} ]; then
  use_tracers=n
fi

# Unique compiler supported upstream is GCC
## Choose between GCC and CLANG config (default is GCC)
## Use the environment variable "_compiler=clang"
if [ "${_compiler}" = "clang" ]; then
  _compiler_flags="CC=clang HOSTCC=clang LLVM=1 LLVM_IAS=1"
fi

# Choose between the 4 main configs for stable branch. Default x86-64-v1 which use CONFIG_GENERIC_CPU2:
# Possible values: config_x86-64-v1 (default) / config_x86-64-v2 / config_x86-64-v3 / config_x86-64-v4
# This will be overwritten by selecting any option in microarchitecture script
# Source files: https://github.com/xanmod/linux/tree/5.17/CONFIGS/xanmod/gcc
if [ -z ${_config+x} ]; then
  _config=config_x86-64-v1
fi

# Compress modules with ZSTD (to save disk space)
if [ -z ${_compress_modules+x} ]; then
  _compress_modules=n
fi

# Compile ONLY used modules to VASTLY reduce the number of modules built
# and the build time.
#
# To keep track of which modules are needed for your specific system/hardware,
# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD read the database kept if it exists
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
if [ -z ${_localmodcfg} ]; then
  _localmodcfg=n
fi

# Tweak kernel options prior to a build via nconfig
if [ -z ${_makenconfig} ]; then
  _makenconfig=n
fi

Personally I'm running now xanmod kernel compiled with this:

env _microarchitecture=98 use_tracers=n use_numa=n _localmodcfg=y _compress_modules=y makepkg -sic

Also, you can now create the file myconfig in your local repo to build this package with a custom config or use ${XDG_CONFIG_HOME}/linux-xanmod/myconfig. This file can be a full kernel config or be a script with several entries to add/remove options (you have several examples in PKGBUILD by using scripts/config):

Code involved:

  for _myconfig in "${SRCDEST}/myconfig" "${HOME}/.config/linux-xanmod/myconfig" "${XDG_CONFIG_HOME}/linux-xanmod/myconfig" ; do
    if [ -f "${_myconfig}" ] && [ "$(wc -l <"${_myconfig}")" -gt "0" ]; then
      if grep -q 'scripts/config' "${_myconfig}"; then
        # myconfig is a partial file. Executing as a script
        msg2 "Applying myconfig..."
        bash -x "${_myconfig}"
      else
        # myconfig is a full config file. Replacing default .config
        msg2 "Using user CUSTOM config..."
        cp -f "${_myconfig}" .config
      fi
      echo
      break
    fi
  done

Can you disable CONFIG_INPUT_EVBUG (enabled by default) like you do for the -git package? It's a security issue in a way that it logs every input, and flood the kernel logs.

@enihcam I know, maybe I need to low to 1000... I took as example upstream config file, which is greater that 10000

https://github.com/xanmod/linux/blob/5.6/.config

Maybe I can grep myconfig looking for "scripts/config" lines, which would be a partial file.

If you know a smarter way to detect if a file if really a kernel config file, I'll be glad to implement.

if [ $(wc -l < "${startdir}/myconfig") -gt 5000 ]; then
  # myconfig is a full config file. Replace it
  msg2 "Using user CUSTOM config..."
  cp -f "${startdir}"/myconfig .config

I don't understand this part, because my config file is less than 3000 lines in total.

@SilverMight: This nvidia-dkms patch (apply to /usr/src/nvidia-440.64, with patch -p2 -i file.patch) works around it for me: https://gitlab.com/snippets/1945940

@ax34 probably you should wait until Nvidia fixes their source for 5.6. Stay in 5.5.x if you need Nvidia.

@Tjuh I have the same failed service long time ago, and it seems related to mono (in my case):

figue@pluto ~ % LC_ALL=C systemctl is-failed systemd-binfmt
failed
figue@pluto ~ % LC_ALL=C pacman -Qo /usr/lib/binfmt.d/mono.conf 
/usr/lib/binfmt.d/mono.conf is owned by mono 6.4.0.198-1
figue@pluto ~ % sudo mv /usr/lib/binfmt.d/mono.conf /tmp
figue@pluto ~ % sudo /usr/lib/systemd/systemd-binfmt                              
figue@pluto ~ % sudo mv /tmp/mono.conf /usr/lib/binfmt.d/mono.conf
figue@pluto ~ % sudo /usr/lib/systemd/systemd-binfmt              
Failed to add binary format: No such file or directory

I don't know if it's a real error or not... Try to google it.

Getting these errors during startup;

systemd-binfmt[963]: Failed to add binary format: No such file or directory systemd[1]: Failed to start Set Up Additional Binary Formats.

@SilverMight, it's a problem with linux 5.6 itself.

Anyone getting an issue using nvidia-dkms with this? It fails to build on my side. Here's the make log: https://hastebin.com/gusiqiqogi.coffeescript

iwlwifi-fix.patch ... FAILED

==> ERROR: One or more files did not pass the validity check!

Is there anyway to get VirtualBox running with this kernel?