path: root/PKGBUILD

# Maintainer: Peter Jung ptr1337 <admin@ptr1337.dev>
# Contributor: Piotr Gorski <lucjan.lucjanov@gmail.com>
# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>
# Contributor: Thomas Baechler <thomas@archlinux.org>

### Selecting the CPU scheduler
# ATTENTION - one of seven predefined values should be selected!
# 'bmq' - select 'BitMap Queue CPU scheduler'
# 'pds' - select 'Priority and Deadline based Skip list multiple queue CPU scheduler'
# 'cacule' - select 'CacULE scheduler'
# 'cacule-rdb' - select 'CacULE-RDB scheduler'
# 'bore' - select 'Burst-Oriented Response Enhancer'
# 'tt' - select 'Task Type Scheduler by Hamad Marri'
# 'cfs' - select 'Completely Fair Scheduler'
_cpusched='cacule'

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

### Tweak kernel options prior to a build via nconfig
_makenconfig=

# NUMA is optimized for multi-socket motherboards.
# A single multi-core CPU actually runs slower with NUMA enabled.
# See, https://bugs.archlinux.org/task/31187
_NUMAdisable=y

## Enable Anbox
_anbox=

# Compile ONLY used modules to VASTLYreduce 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
_localmodcfg=

# Use the current kernel's .config file
# Enabling this option will use the .config of the RUNNING kernel rather than
# the ARCH defaults. Useful when the package gets updated and you already went
# through the trouble of customizing your config options.  NOT recommended when
# a new kernel is released, but again, convenient for package bumps.
_use_current=

### Enable KBUILD_CFLAGS -O3
_cc_harder=y

### Set performance governor as default
_per_gov=y

### Enable TCP_CONG_BBR2
_tcp_bbr2=y

### Running with a 1000HZ, 750Hz, 600 Hz or 500Hz tick rate
_HZ_ticks=750

## Choose between perodic, tickless idle or full tickless
### Full tickless can give higher performances in various cases but, depending on hardware, lower consistency.
_tickrate=full

## Choose between full(low-latency), voluntary or server
_preempt=voluntary

### Disable MQ-Deadline I/O scheduler
_mq_deadline_disable=y

### Disable Kyber I/O scheduler
_kyber_disable=y

### Enable multigenerational LRU
_lru_enable=y

## Enable DAMON
_damon=y

## enable SPECULATIVE_PAGE_FAULT
_spf_enable=y

## Enable Linux Random Number Generator
_lrng_enable=y

## Apply Kernel automatic Optimization
_use_auto_optimization=y

## Apply Kernel Optimization selecting
_use_optimization_select=

## Enable zram/zswap ZSTD compression
_zstd_compression=y

_nf_cone=y

# Clang LTO mode, only available with the "llvm" compiler - options are "no", "full" or "thin".
# "full: uses 1 thread for Linking, slow and uses more memory, theoretically with the highest performance gains."
# "thin: uses multiple threads, faster and uses less memory, may have a lower runtime performance than Full."
_use_llvm_lto=

## Change the thin lto cachedir for fixing building several dkms modules including zfs
_thin_lto_cachedir=

## Enable it for using the LLVM CFI PATCH for a better security
_use_cfi=

if [ -n "$_use_llvm_lto" ]; then
    pkgbase=linux-${_cpusched}-lto
else
    pkgbase=linux-${_cpusched}
fi
_major=5.17
_minor=6
#_minorc=$((_minor+1))
#_rcver=rc8
pkgver=${_major}.${_minor}
_stable=${_major}.${_minor}
#_stable=${_major}
#_stablerc=${_major}-${_rcver}
_srcname=linux-${_stable}
#_srcname=linux-${_major}
arch=(x86_64 x86_64_v3)
pkgdesc='Linux cacULE scheduler Kernel by CachyOS with other patches and improvements'
pkgrel=1
arch=('x86_64' 'x86_64_v3')
url="https://github.com/CachyOS/linux-cachyos"
license=('GPL2')
options=('!strip')
makedepends=('bc' 'texlive-latexextra' 'libelf' 'pahole' 'cpio' 'perl' 'tar' 'xz' 'zstd' 'xmlto' 'git' 'gcc' 'gcc-libs' 'glibc' 'binutils' 'make' 'patch')
if [ -n "$_use_llvm_lto" ]; then
    depends+=(clang llvm lld python)
    BUILD_FLAGS=(
        CC=clang
        LD=ld.lld
        LLVM=1
        LLVM_IAS=1
    )
fi
_patchsource="https://raw.githubusercontent.com/ptr1337/kernel-patches/master/${_major}"
source=(
    "https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/${_srcname}.tar.xz"
    "config"
)
if [ "$_cpusched" = "bmq" ]; then
    source+=("${_patchsource}/sched/0001-prjc.patch")
fi
if [ "$_cpusched" = "pds" ]; then
    source+=("${_patchsource}/sched/0001-prjc.patch")
fi
if [ "$_cpusched" = "cacule" ]; then
    source+=("${_patchsource}/sched/0001-cacULE.patch")
fi
if [ "$_cpusched" = "cacule-rdb" ]; then
    source+=("${_patchsource}/sched/0001-cacULE.patch")
fi
if [ "$_cpusched" = "tt" ]; then
    source+=("${_patchsource}/sched/0001-tt.patch")
fi
if [ "$_cpusched" = "bore" ]; then
    source+=("${_patchsource}/sched/0001-bore-sched.patch")
fi
source+=(
    "${_patchsource}/0001-arch.patch"
    "${_patchsource}/0002-anbox.patch"
    "${_patchsource}/0003-bbr2.patch"
    "${_patchsource}/0004-cachy.patch"
    "${_patchsource}/0005-clearlinux.patch"
    "${_patchsource}/0006-cpu.patch"
    "${_patchsource}/0007-fixes-miscellaneous.patch"
    "${_patchsource}/0008-fs-patches.patch"
    "${_patchsource}/0009-hwmon.patch"
    "${_patchsource}/0010-lru-le9.patch"
    "${_patchsource}/0011-spf-lru.patch"
    "${_patchsource}/0012-xanmod.patch"
    "${_patchsource}/0013-lrng.patch"
    "${_patchsource}/0014-ck-hrtimer.patch"
    "${_patchsource}/0015-futex-winesync.patch"
    "auto-cpu-optimization.sh"
)
if [ -n "$_thin_lto_cachedir" ] && [ "$_use_llvm_lto" = "thin" ]; then
    source+=(
        "${_patchsource}/0016-thinlto-cachedir.patch"
    )
fi

export KBUILD_BUILD_HOST=archlinux
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {

    cd $_srcname

    ### Setting version
    echo "Setting version..."
    scripts/setlocalversion --save-scmversion
    echo "-$pkgrel" > localversion.10-pkgrel
    echo "${pkgbase#linux}" > localversion.20-pkgname

    ### Patching sources
    local src
    for src in "${source[@]}"; do
        src="${src%%::*}"
        src="${src##*/}"
        [[ $src = *.patch ]] || continue
        echo "Applying patch $src..."
        patch -Np1 < "../$src"
    done

    ### Setting config
    echo "Setting config..."
    cp ../config .config

    ### Microarchitecture Optimization (GCC/CLANG)
    if [ -n "$_use_auto_optimization" ]; then
        "${srcdir}"/auto-cpu-optimization.sh
    fi

    if [ -n "$_use_optimization_select" ]; then
        source "${startdir}"/configure
        cpu_arch
    fi

    ### Selecting the CPU scheduler
    if [ "$_cpusched" = "bmq" ]; then
        echo "Selecting BMQ CPU scheduler..."
        scripts/config --enable CONFIG_SCHED_ALT
        scripts/config --enable CONFIG_SCHED_BMQ
        scripts/config --disable CONFIG_SCHED_PDS
    elif [ "$_cpusched" = "pds" ]; then
        echo "Selecting PDS CPU scheduler..."
        scripts/config --enable CONFIG_SCHED_ALT
        scripts/config --disable CONFIG_SCHED_BMQ
        scripts/config --enable CONFIG_SCHED_PDS
    elif [ "$_cpusched" = "cacule" ]; then
        echo "Selecting CacULE scheduler..."
        scripts/config --enable CONFIG_CACULE_SCHED
        scripts/config --disable CONFIG_CACULE_RDB
    elif [ "$_cpusched" = "cacule-rdb" ]; then
        echo "Selecting CacULE-RDB scheduler..."
        scripts/config --enable CONFIG_CACULE_SCHED
        scripts/config --enable CONFIG_CACULE_RDB
        scripts/config --set-val CONFIG_RDB_INTERVAL 19
    elif [ "$_cpusched" = "tt" ]; then
        echo "Enable TT CPU scheduler..."
        scripts/config --enable CONFIG_TT_SCHED
        scripts/config --enable CONFIG_TT_ACCOUNTING_STATS
    elif [ "$_cpusched" = "bore" ]; then
        echo "Selecting BORE Scheduler..."
        scripts/config --enable CONFIG_SCHED_BORE
    elif [ "$_cpusched" = "cfs" ]; then
        echo "Selecting Completely Fair Scheduler..."
    else
        if [ -n "$_cpusched" ]; then
            error "The value $_cpusched is invalid. Choose the correct one again."
        else
            error "The value is empty. Choose the correct one again."
        fi
        error "Selecting the CPU scheduler failed!"
        exit
    fi

    ## Enable it for using the LLVM CFI PATCH for a better security
    if [ -n "$_use_cfi" ] && [ -n "$_use_llvm_lto" ]; then
        echo "Enabling CFI"
        scripts/config --enable CONFIG_ARCH_SUPPORTS_CFI_CLANG
        scripts/config --enable CONFIG_CFI_CLANG
    fi

    ### Selecting the THIN or FULL-LTO compression level
    if [ "$_use_llvm_lto" = "thin" ]; then
        echo "Enabling LLVM THIN LTO..."
        scripts/config --disable LTO_NONE \
            --enable LTO \
            --enable LTO_CLANG \
            --enable ARCH_SUPPORTS_LTO_CLANG \
            --enable ARCH_SUPPORTS_LTO_CLANG_THIN \
            --enable HAS_LTO_CLANG \
            --enable LTO_CLANG_THIN \
            --enable HAVE_GCC_PLUGINS
    elif [ "$_use_llvm_lto" = "full" ]; then
        echo "Enabling LLVM FULL LTO..."
        scripts/config --disable LTO_NONE \
            --enable LTO \
            --enable LTO_CLANG \
            --enable ARCH_SUPPORTS_LTO_CLANG \
            --enable ARCH_SUPPORTS_LTO_CLANG_THIN \
            --enable HAS_LTO_CLANG \
            --enable LTO_CLANG \
            --enable LTO_CLANG_FULL \
            --enable HAVE_GCC_PLUGINS
    else
        scripts/config --enable CONFIG_LTO_NONE
    fi

    ### Optionally set tickrate to 1000Hz
    if [ "$_HZ_ticks" = "1000" ]; then
        echo "Setting tick rate to 1k Hz..."
        scripts/config --disable CONFIG_HZ_300
        scripts/config --enable CONFIG_HZ_1000
        scripts/config --set-val CONFIG_HZ 1000

        ### Optionally set tickrate to 750HZ
    elif [ "$_HZ_ticks" = "750" ]; then
        echo "Setting tick rate to 750Hz..."
        scripts/config --disable CONFIG_HZ_300
        scripts/config --enable CONFIG_HZ_750
        scripts/config --set-val CONFIG_HZ 750

        ### Optionally set tickrate to 600HZ
    elif [ "$_HZ_ticks" = "600" ]; then
        echo "Setting tick rate to 600Hz..."
        scripts/config --disable CONFIG_HZ_300
        scripts/config --enable CONFIG_HZ_600
        scripts/config --set-val CONFIG_HZ 600

        ### Optionally set tickrate to 500HZ
    elif [ "$_HZ_ticks" = "500" ]; then
        echo "Setting tick rate to 500Hz..."
        scripts/config --disable CONFIG_HZ_300
        scripts/config --enable CONFIG_HZ_500
        scripts/config --set-val CONFIG_HZ 500
        ### Optionally set tickrate to 300HZ
    elif [ "$_HZ_ticks" = "300" ]; then
        echo "Setting tick rate to 300Hz..."
    fi

    ### Optionally disable NUMA for 64-bit kernels only
    # (x86 kernels do not support NUMA)
    if [ -n "$_NUMAdisable" ]; then
        echo "Disabling NUMA from kernel config..."
        scripts/config --disable CONFIG_NUMA
        scripts/config --disable CONFIG_AMD_NUMA
        scripts/config --disable CONFIG_X86_64_ACPI_NUMA
        scripts/config --disable CONFIG_NODES_SPAN_OTHER_NODES
        scripts/config --disable CONFIG_NUMA_EMU
        scripts/config --disable CONFIG_NEED_MULTIPLE_NODES
        scripts/config --disable CONFIG_USE_PERCPU_NUMA_NODE_ID
        scripts/config --disable CONFIG_ACPI_NUMA
        scripts/config --disable CONFIG_ARCH_SUPPORTS_NUMA_BALANCING
        scripts/config --disable CONFIG_NODES_SHIFT
        scripts/config --undefine CONFIG_NODES_SHIFT
        scripts/config --disable CONFIG_NEED_MULTIPLE_NODES
    fi

    ### Disable MQ-Deadline I/O scheduler
    if [ -n "$_mq_deadline_disable" ]; then
        echo "Disabling MQ-Deadline I/O scheduler..."
        scripts/config --disable CONFIG_MQ_IOSCHED_DEADLINE
    fi

    ### Disable Kyber I/O scheduler
    if [ -n "$_kyber_disable" ]; then
        echo "Disabling Kyber I/O scheduler..."
        scripts/config --disable CONFIG_MQ_IOSCHED_KYBER
    fi

    ### Set performance governor
    if [ -n "$_per_gov" ]; then
        echo "Setting performance governor..."
        scripts/config --disable CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
        scripts/config --enable CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
        echo "Set PCIEASPM DRIVER to performance..."
        scripts/config --enable CONFIG_PCIEASPM
        scripts/config --enable CONFIG_PCIEASPM_PERFORMANCE
        echo "Set CONFIG_PCIE_BUS for performance..."
        scripts/config --enable CONFIG_PCIE_BUS_PERFORMANCE
    fi

    ### Selecting between tickless idle, perodic tics or full tickless
    if [ "$_tickrate" = "perodic" ]; then
        echo "Enabling periodic ticks..."
        scripts/config --disable CONFIG_NO_HZ_IDLE
        scripts/config --disable CONFIG_NO_HZ_FULL
        scripts/config --disable CONFIG_NO_HZ
        scripts/config --disable CONFIG_NO_HZ_COMMON
        scripts/config --enable CONFIG_HZ_PERIODIC
    elif [ "$_tickrate" = "idle" ]; then
        echo "Enabling tickless idle..."
        scripts/config --disable CONFIG_HZ_PERIODIC
        scripts/config --disable CONFIG_NO_HZ_FULL
        scripts/config --enable CONFIG_NO_HZ_IDLE
        scripts/config --enable CONFIG_NO_HZ
        scripts/config --enable CONFIG_NO_HZ_COMMON
    elif [ "$_tickrate" = "full" ]; then
        echo "Enabling tickless idle..."
        scripts/config --disable CONFIG_HZ_PERIODIC
        scripts/config --disable CONFIG_NO_HZ_IDLE
        scripts/config --disable CONFIG_CONTEXT_TRACKING_FORCE
        scripts/config --enable CONFIG_NO_HZ_FULL_NODEF
        scripts/config --enable CONFIG_NO_HZ_FULL
        scripts/config --enable CONFIG_NO_HZ
        scripts/config --enable CONFIG_NO_HZ_COMMON
        scripts/config --enable CONFIG_CONTEXT_TRACKING
    fi

    ### Selecting between preempt
    if [ "$_preempt" = "full" ]; then
        echo "Enabling low latency preempt..."
        scripts/config --enable CONFIG_PREEMPT_BUILD
        scripts/config --disable CONFIG_PREEMPT_NONE
        scripts/config --disable CONFIG_PREEMPT_VOLUNTARY
        scripts/config --enable CONFIG_PREEMPT
        scripts/config --enable CONFIG_PREEMPT_COUNT
        scripts/config --enable CONFIG_PREEMPTION
        scripts/config --enable CONFIG_PREEMPT_DYNAMIC
    elif [ "$_preempt" = "voluntary" ]; then
        echo "Enabling tickless idle..."
        scripts/config --enable CONFIG_PREEMPT_BUILD
        scripts/config --disable CONFIG_PREEMPT_NONE
        scripts/config --enable CONFIG_PREEMPT_VOLUNTARY
        scripts/config --disable CONFIG_PREEMPT
        scripts/config --enable CONFIG_PREEMPT_COUNT
        scripts/config --enable CONFIG_PREEMPTION
        scripts/config --enable CONFIG_PREEMPT_DYNAMIC
    elif [ "$_tickrate" = "server" ]; then
        echo "Enabling tickless idle..."
        scripts/config --enable CONFIG_PREEMPT_NONE_BUILD
        scripts/config --enable CONFIG_PREEMPT_NONE
        scripts/config --disable CONFIG_PREEMPT_VOLUNTARY
        scripts/config --disable CONFIG_PREEMPT
        scripts/config --disable CONFIG_PREEMPT_COUNT
        scripts/config --disable CONFIG_PREEMPTION
        scripts/config --disable CONFIG_PREEMPT_DYNAMIC
    fi

    ### Enable KBUILD_CFLAGS -O3
    if [ -n "$_cc_harder" ]; then
        echo "Enabling KBUILD_CFLAGS -O3..."
        scripts/config --disable CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
        scripts/config --enable CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
    fi

    ### Enable TCP_CONG_BBR2
    if [ -n "$_tcp_bbr2" ]; then
        echo "Disabling TCP_CONG_CUBIC..."
        scripts/config --module CONFIG_TCP_CONG_CUBIC
        scripts/config --disable CONFIG_DEFAULT_CUBIC
        echo "Enabling TCP_CONG_BBR2..."
        scripts/config --enable CONFIG_TCP_CONG_BBR2
        scripts/config --enable CONFIG_DEFAULT_BBR2
        scripts/config --set-str CONFIG_DEFAULT_TCP_CONG bbr2
    fi

    ### Enable FULLCONENAT
    if [ -n "$_nf_cone" ]; then
        echo "Enabling FULLCONENAT..."
        scripts/config --module CONFIG_IP_NF_TARGET_FULLCONENAT
        scripts/config --module CONFIG_NETFILTER_XT_TARGET_FULLCONENAT
    fi

    ### Enable SPF
    if [ -n "$_spf_enable" ]; then
        echo "Enabling SPECULATIVE_PAGE_FAULT LRU..."
        scripts/config --enable CONFIG_SPECULATIVE_PAGE_FAULT
    fi

    ### Enable multigenerational LRU
    if [ -n "$_lru_enable" ]; then
        echo "Enabling multigenerational LRU..."
        scripts/config --enable CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG
        scripts/config --enable CONFIG_LRU_GEN
        scripts/config --enable CONFIG_LRU_GEN_ENABLED
        scripts/config --disable CONFIG_LRU_GEN_STATS
    fi

    ### Enable DAMON
    if [ -n "$_damon" ]; then
        echo "Enabling DAMON..."
        scripts/config --enable CONFIG_DAMON
        scripts/config --disable CONFIG_DAMON_VADDR
        scripts/config --disable CONFIG_DAMON_DBGFS
        scripts/config --enable CONFIG_DAMON_PADDR
        scripts/config --enable CONFIG_DAMON_RECLAIM
    fi

    ### Enable Linux Random Number Generator
    if [ -n "$_lrng_enable" ]; then
        echo "Enabling Linux Random Number Generator ..."
        scripts/config --disable CONFIG_RANDOM_DEFAULT_IMPL
        scripts/config --enable CONFIG_LRNG
        scripts/config --enable CONFIG_LRNG_OVERSAMPLE_ENTROPY_SOURCES
        scripts/config --set-val CONFIG_CONFIG_LRNG_OVERSAMPLE_ES_BITS 64
        scripts/config --set-val CONFIG_LRNG_SEED_BUFFER_INIT_ADD_BITS 128
        scripts/config --enable CONFIG_LRNG_IRQ
        scripts/config --enable CONFIG_LRNG_CONTINUOUS_COMPRESSION_ENABLED
        scripts/config --disable CONFIG_LRNG_CONTINUOUS_COMPRESSION_DISABLED
        scripts/config --enable CONFIG_LRNG_ENABLE_CONTINUOUS_COMPRESSION
        scripts/config --enable CONFIG_LRNG_SWITCHABLE_CONTINUOUS_COMPRESSION
        scripts/config --disable CONFIG_LRNG_COLLECTION_SIZE_512
        scripts/config --enable CONFIG_LRNG_COLLECTION_SIZE_1024
        scripts/config --disable CONFIG_LRNG_COLLECTION_SIZE_2048
        scripts/config --disable CONFIG_LRNG_COLLECTION_SIZE_4096
        scripts/config --disable CONFIG_LRNG_COLLECTION_SIZE_8192
        scripts/config --set-val CONFIG_LRNG_COLLECTION_SIZE 1024
        scripts/config --enable CONFIG_LRNG_HEALTH_TESTS
        scripts/config --set-val CONFIG_LRNG_RCT_CUTOFF 31
        scripts/config --set-val CONFIG_LRNG_APT_CUTOFF 325
        scripts/config --set-val CONFIG_LRNG_IRQ_ENTROPY_RATE 256
        scripts/config --enable CONFIG_LRNG_JENT
        scripts/config --set-val CONFIG_LRNG_JENT_ENTROPY_RATE 16
        scripts/config --enable CONFIG_LRNG_CPU
        scripts/config --set-val CONFIG_LRNG_CPU_ENTROPY_RATE 8
        scripts/config --enable CONFIG_LRNG_DRNG_SWITCH
        scripts/config --enable CONFIG_LRNG_KCAPI_HASH
        scripts/config --module CONFIG_LRNG_DRBG
        scripts/config --module CONFIG_LRNG_KCAPI
        scripts/config --enable CONFIG_LRNG_TESTING_MENU
        scripts/config --disable CONFIG_LRNG_RAW_HIRES_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_JIFFIES_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_IRQ_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_IRQFLAGS_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_RETIP_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_REGS_ENTROPY
        scripts/config --disable CONFIG_LRNG_RAW_ARRAY
        scripts/config --disable CONFIG_LRNG_IRQ_PERF
        scripts/config --disable CONFIG_LRNG_ACVT_HASH
        scripts/config --enable CONFIG_LRNG_RUNTIME_ES_CONFIG
        scripts/config --disable CONFIG_LRNG_RUNTIME_MAX_WO_RESEED_CONFIG
        scripts/config --disable CONFIG_LRNG_TEST_CPU_ES_COMPRESSION
        scripts/config --enable CONFIG_LRNG_SELFTEST
        scripts/config --disable CONFIG_LRNG_SELFTEST_PANIC
    fi

    ### Enable zram/zswap ZSTD compression
    if [ -n "$_zstd_swap_compression" ]; then
        echo "Enabling zram ZSTD compression..."
        scripts/config --disable CONFIG_ZRAM_DEF_COMP_LZORLE
        scripts/config --enable CONFIG_ZRAM_DEF_COMP_ZSTD
        scripts/config --set-str CONFIG_ZRAM_DEF_COMP zstd
        echo "Enabling zswap ZSTD compression..."
        scripts/config --disable CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4
        scripts/config --enable CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD
        scripts/config --set-str CONFIG_ZSWAP_COMPRESSOR_DEFAULT zstd
    fi

    ## Enable Anbox Support
    if [ -n "$_anbox" ]; then
        echo "Enable Anbox..."
        scripts/config --enable CONFIG_ASHMEM
        scripts/config --enable CONFIG_ANDROID
        scripts/config --enable CONFIG_ANDROID_BINDER_IPC
        scripts/config --enable CONFIG_ANDROID_BINDERFS
        scripts/config --enable CONFIG_ANDROID_BINDER_DEVICES="binder,hwbinder,vndbinder"
    fi

    echo "disable debugging features to reduce the size..."
    scripts/config --disable CONFIG_DEBUG_INFO
    scripts/config --disable CONFIG_CGROUP_BPF
    scripts/config --disable CONFIG_BPF_LSM
    scripts/config --disable CONFIG_BPF_PRELOAD
    scripts/config --disable CONFIG_BPF_LIRC_MODE2
    scripts/config --disable CONFIG_BPF_KPROBE_OVERRIDE
    scripts/config --enable CONFIG_PSI_DEFAULT_DISABLED
    scripts/config --disable CONFIG_LATENCYTOP
    scripts/config --disable CONFIG_SCHED_DEBUG
    scripts/config --disable CONFIG_KVM_WERROR

    echo "Enable CONFIG_USER_NS_UNPRIVILEGED"
    scripts/config --enable CONFIG_USER_NS

    echo "Enable WINE FASTSYNC"
    scripts/config --enable CONFIG_WINESYNC

    ### Optionally use running kernel's config
    # code originally by nous; http://aur.archlinux.org/packages.php?ID=40191
    if [ -n "$_use_current" ]; then
        if [[ -s /proc/config.gz ]]; then
            echo "Extracting config from /proc/config.gz..."
            # modprobe configs
            zcat /proc/config.gz > ./.config
        else
            warning "Your kernel was not compiled with IKCONFIG_PROC!"
            warning "You cannot read the current config!"
            warning "Aborting!"
            exit
        fi
    fi


    ### Optionally load needed modules for the make localmodconfig
    # See https://aur.archlinux.org/packages/modprobed-db
    if [ -n "$_localmodcfg" ]; then
        if [ -e $HOME/.config/modprobed.db ]; then
            echo "Running Steven Rostedt's make localmodconfig now"
            make ${BUILD_FLAGS[*]} LSMOD=$HOME/.config/modprobed.db localmodconfig
        else
            echo "No modprobed.db data found"
            exit
        fi
    fi



    echo "Applying default config..."

    make ${BUILD_FLAGS[*]}  olddefconfig
    make ${BUILD_FLAGS[*]} -s kernelrelease > version
    echo "Prepared $pkgbase version $(<version)"

    ### Running make nconfig
    [[ -z "$_makenconfig" ]] || make ${BUILD_FLAGS[*]} nconfig

    ### Save configuration for later reuse
    cp -Tf ./.config "${startdir}/config-${pkgver}-${pkgrel}${pkgbase#linux}"

}

build() {
    cd ${_srcname}
    make ${BUILD_FLAGS[*]} -j$(nproc) all
}

_package() {
    pkgdesc="The $pkgdesc kernel and modules"
    depends=('coreutils' 'kmod' 'initramfs')
    optdepends=('crda: to set the correct wireless channels of your country'
        'linux-firmware: firmware images needed for some devices'
    'modprobed-db: Keeps track of EVERY kernel module that has ever been probed - useful for those of us who make localmodconfig')
    provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE KSMBD-MODULE)

    cd $_srcname
    local kernver="$(<version)"
    local modulesdir="$pkgdir/usr/lib/modules/$kernver"

    echo "Installing boot image..."
    # systemd expects to find the kernel here to allow hibernation
    # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
    install -Dm644 "$(make ${BUILD_FLAGS[*]} -s image_name)" "$modulesdir/vmlinuz"

    # Used by mkinitcpio to name the kernel
    echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"

    echo "Installing modules..."
    make ${BUILD_FLAGS[*]} INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 \
        DEPMOD=/doesnt/exist modules_install  # Suppress depmod

    # remove build and source links
    rm "$modulesdir"/{source,build}
}

_package-headers() {
    pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
    depends=(pahole)

    cd $_srcname
    local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

    echo "Installing build files..."
    install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
        localversion.* version vmlinux
    install -Dt "$builddir/kernel" -m644 kernel/Makefile
    install -Dt "$builddir/arch/x86" -m644 arch/x86/Makefile
    cp -t "$builddir" -a scripts

    # required when STACK_VALIDATION is enabled
    install -Dt "$builddir/tools/objtool" tools/objtool/objtool

    # required when DEBUG_INFO_BTF_MODULES is enabled
    # install -Dt "$builddir/tools/bpf/resolve_btfids" tools/bpf/resolve_btfids/resolve_btfids

    echo "Installing headers..."
    cp -t "$builddir" -a include
    cp -t "$builddir/arch/x86" -a arch/x86/include
    install -Dt "$builddir/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

    install -Dt "$builddir/drivers/md" -m644 drivers/md/*.h
    install -Dt "$builddir/net/mac80211" -m644 net/mac80211/*.h

    # https://bugs.archlinux.org/task/13146
    install -Dt "$builddir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

    # https://bugs.archlinux.org/task/20402
    install -Dt "$builddir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
    install -Dt "$builddir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
    install -Dt "$builddir/drivers/media/tuners" -m644 drivers/media/tuners/*.h

    # https://bugs.archlinux.org/task/71392
    install -Dt "$builddir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

    echo "Installing KConfig files..."
    find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

    echo "Removing unneeded architectures..."
    local arch
    for arch in "$builddir"/arch/*/; do
        [[ $arch = */x86/ ]] && continue
        echo "Removing $(basename "$arch")"
        rm -r "$arch"
    done

    echo "Removing documentation..."
    rm -r "$builddir/Documentation"

    echo "Removing broken symlinks..."
    find -L "$builddir" -type l -printf 'Removing %P\n' -delete

    echo "Removing loose objects..."
    find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

    echo "Stripping build tools..."
    local file
    while read -rd '' file; do
        case "$(file -bi "$file")" in
            application/x-sharedlib\;*)      # Libraries (.so)
                strip -v $STRIP_SHARED "$file" ;;
            application/x-archive\;*)        # Libraries (.a)
                strip -v $STRIP_STATIC "$file" ;;
            application/x-executable\;*)     # Binaries
                strip -v $STRIP_BINARIES "$file" ;;
            application/x-pie-executable\;*) # Relocatable binaries
                strip -v $STRIP_SHARED "$file" ;;
        esac
    done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

    # echo "Stripping vmlinux..."
    # strip -v $STRIP_STATIC "$builddir/vmlinux"
    # not needed since not building with CONFIG_DEBUG_INFO=y

    echo "Adding symlink..."
    mkdir -p "$pkgdir/usr/src"
    ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase"

}

pkgname=("$pkgbase" "$pkgbase-headers")
for _p in "${pkgname[@]}"; do
    eval "package_$_p() {
    $(declare -f "_package${_p#$pkgbase}")
    _package${_p#$pkgbase}
    }"
done

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