build-upstream-RT-raspi-kernel.sh

#!/bin/bash

echo -n "Kernel version: "
read KVAR
set -xe
wget -T 10 https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-${KVAR}.tar.xz
tar Jxf linux-${KVAR}.tar.xz &
pid=$!
wget -T 10 https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patch-5.10.59-rt52.patch.xz
apt-get -q -y update
set +e
apt-get --purge dist-upgrade
set -e
apt-get -q -y install linux-config-5.10
apt-get -q -y install build-essential libncurses-dev fakeroot dpkg-dev gcc-10-plugin-dev
apt-get -q -y build-dep linux
wait $pid
cd linux-${KVAR}
xzcat ../patch-5.10.59-rt52.patch.xz | patch --quiet -p1

if [ `dpkg --print-architecture` = arm64 ]; then
  xzcat /usr/src/linux-config-5.10/config.arm64_rt_arm64.xz >.config
  apt-get -q -y --install-recommends install g++-arm-linux-gnueabihf gcc-arm-linux-gnueabihf cpp-arm-linux-gnueabihf gcc-10-plugin-dev-arm-linux-gnueabihf
  echo 'CONFIG_BPF_JIT_ALWAYS_ON=y' >>.config
  echo 'CONFIG_ZONE_DEVICE=y' >>.config
  echo 'CONFIG_DEVICE_PRIVATE=y' >>.config
  echo 'CONFIG_ARCH_MMAP_RND_BITS=33' >>.config
  echo 'CONFIG_ARCH_MMAP_RND_COMPAT_BITS=16' >>.config
  echo 'CONFIG_ARM64_SW_TTBR0_PAN=y' >>.config
elif [ `dpkg --print-architecture` = armhf ]; then
  xzcat /usr/src/linux-config-5.10/config.armhf_none_armmp-lpae.xz >.config
  ARCH=arm
  export ARCH
  cat >>.config <<'EOF'
CONFIG_ARCH_MMAP_RND_BITS=16
CONFIG_CPU_SW_DOMAIN_PAN=y
CONFIG_VIRTUALIZATION=n
CONFIG_ARCH_ASPEED=n
CONFIG_MACH_ASPEED_G6=n
CONFIG_ARCH_BCM=y
CONFIG_ARCH_EXYNOS=n
CONFIG_S5P_DEV_MFC=n
CONFIG_ARCH_EXYNOS4=n
CONFIG_ARCH_EXYNOS5=n
CONFIG_CPU_EXYNOS4210=n
CONFIG_SOC_EXYNOS4412=n
CONFIG_SOC_EXYNOS5250=n
CONFIG_SOC_EXYNOS5260=n
CONFIG_SOC_EXYNOS5410=n
CONFIG_SOC_EXYNOS5420=n
CONFIG_SOC_EXYNOS5800=n
CONFIG_EXYNOS_MCPM=n
CONFIG_EXYNOS_CPU_SUSPEND=n
CONFIG_ARCH_HIGHBANK=n
CONFIG_ARCH_MXC=n
CONFIG_MXC_TZIC=n
CONFIG_HAVE_IMX_ANATOP=n
CONFIG_HAVE_IMX_GPC=n
CONFIG_HAVE_IMX_MMDC=n
CONFIG_HAVE_IMX_SRC=n
CONFIG_SOC_IMX5=n
CONFIG_SOC_IMX51=n
CONFIG_SOC_IMX53=n
CONFIG_SOC_IMX6=n
CONFIG_SOC_IMX6Q=n
CONFIG_SOC_IMX6SL=n
CONFIG_SOC_IMX6SLL=n
CONFIG_SOC_IMX6SX=n
CONFIG_SOC_IMX6UL=n
CONFIG_ARCH_MESON=n
CONFIG_MACH_MESON6=n
CONFIG_MACH_MESON8=n
CONFIG_ARCH_MMP=n
CONFIG_MACH_MMP2_DT=n
CONFIG_ARCH_MVEBU=n
CONFIG_MACH_MVEBU_ANY=n
CONFIG_MACH_MVEBU_V7=n
CONFIG_MACH_ARMADA_370=n
CONFIG_MACH_ARMADA_375=n
CONFIG_MACH_ARMADA_38X=n
CONFIG_MACH_ARMADA_39X=n
CONFIG_MACH_ARMADA_XP=n
CONFIG_MACH_DOVE=n
CONFIG_ARCH_OMAP=n
CONFIG_POWER_AVS_OMAP=n
CONFIG_POWER_AVS_OMAP_CLASS3=n
CONFIG_OMAP_RESET_CLOCKS=n
CONFIG_OMAP_32K_TIMER=n
CONFIG_MACH_OMAP_GENERIC=n
CONFIG_ARCH_OMAP3=n
CONFIG_ARCH_OMAP4=n
CONFIG_SOC_OMAP5=n
CONFIG_SOC_AM33XX=n
CONFIG_SOC_DRA7XX=n
CONFIG_ARCH_OMAP2PLUS=n
CONFIG_OMAP_INTERCONNECT_BARRIER=n
CONFIG_ARCH_OMAP2PLUS_TYPICAL=n
CONFIG_SOC_HAS_OMAP2_SDRC=n
CONFIG_SOC_HAS_REALTIME_COUNTER=n
CONFIG_SOC_OMAP3430=n
CONFIG_SOC_TI81XX=n
CONFIG_OMAP_PACKAGE_CBB=n
CONFIG_MACH_OMAP3517EVM=n
CONFIG_MACH_OMAP3_PANDORA=n
CONFIG_PXA_SSP=m
CONFIG_ARCH_ROCKCHIP=n
CONFIG_ARCH_SOCFPGA=n
CONFIG_ARCH_STM32=n
CONFIG_MACH_STM32MP157=n
CONFIG_ARCH_SUNXI=n
CONFIG_MACH_SUN4I=n
CONFIG_MACH_SUN5I=n
CONFIG_MACH_SUN6I=n
CONFIG_MACH_SUN7I=n
CONFIG_MACH_SUN8I=n
CONFIG_MACH_SUN9I=n
CONFIG_ARCH_SUNXI_MC_SMP=n
CONFIG_ARCH_TEGRA=n
CONFIG_ARCH_VEXPRESS=n
CONFIG_ARCH_VEXPRESS_CORTEX_A5_A9_ERRATA=n
CONFIG_ARCH_VT8500=n
CONFIG_ARCH_WM8850=n
CONFIG_PLAT_ORION=n
CONFIG_PLAT_PXA=n
CONFIG_PLAT_VERSATILE=n
EOF
else
  echo "Unknown architecture"
  exit 1
fi
cp .config .config-orig
cat >>.config <<'EOF'
CONFIG_CRYPTO_AEGIS128_SIMD=n
CONFIG_ARM64_HW_AFDBM=n
CONFIG_ARM64_PAN=n
CONFIG_AS_HAS_LSE_ATOMICS=n
CONFIG_ARM64_LSE_ATOMICS=n
CONFIG_ARM64_USE_LSE_ATOMICS=n
CONFIG_ARM64_VHE=n
CONFIG_ARM64_UAO=n
CONFIG_ARM64_PMEM=n
CONFIG_ARM64_RAS_EXTN=n
CONFIG_ARM64_CNP=n
CONFIG_ARM64_PTR_AUTH=n
CONFIG_CC_HAS_BRANCH_PROT_PAC_RET=n
CONFIG_CC_HAS_SIGN_RETURN_ADDRESS=n
CONFIG_AS_HAS_PAC=n
CONFIG_AS_HAS_CFI_NEGATE_RA_STATE=n
CONFIG_ARM64_AMU_EXTN=n
CONFIG_AS_HAS_ARMV8_4=n
CONFIG_ARM64_TLB_RANGE=n
CONFIG_ARM64_BTI=n
CONFIG_ARM64_BTI_KERNEL=n
CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI=n
CONFIG_ARM64_E0PD=n
CONFIG_ARCH_RANDOM=n
CONFIG_ARM64_AS_HAS_MTE=n
CONFIG_ARM64_MTE=n
CONFIG_ARM_SMMU_V3_SVA=y
CONFIG_GOOGLE_FIRMWARE=n
CONFIG_CHROME_PLATFORMS=n

CONFIG_ARM_PSCI_FW=n
CONFIG_CPU_IDLE=n


CONFIG_USERFAULTFD=n
CONFIG_CGROUP_MISC=y
CONFIG_ARCH_APPLE=n
CONFIG_ARCH_INTEL_SOCFPGA=n
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y
CONFIG_NET_VENDOR_MICROSOFT=n
CONFIG_PWM_RASPBERRYPI_POE=m
CONFIG_NVMEM_RMEM=m
CONFIG_NETFS_STATS=y
CONFIG_UBSAN_SHIFT=y
CONFIG_DEBUG_IRQFLAGS=y
CONFIG_HZ_250=n
CONFIG_HZ_100=y
CONFIG_PREEMPT_RT=y
# https://wiki.linuxfoundation.org/realtime/documentation/howto/applications/preemptrt_setup
CONFIG_HOTPLUG_CPU=n
CONFIG_NUMA=n
CONFIG_VIRTUALIZATION=n
CONFIG_ACPI=n
CONFIG_EFI=n
CONFIG_SECURITY_TOMOYO=n
CONFIG_LATENCYTOP=y
CONFIG_DEBUG_INFO=n
CONFIG_DEBUG_PREEMPT=y
CONFIG_FORTIFY_SOURCE=y
CONFIG_UBSAN=y
CONFIG_UBSAN_BOUNDS=y
CONFIG_UBSAN_SANITIZE_ALL=y
CONFIG_UBSAN_MISC=y
CONFIG_UBSAN_UNREACHABLE=y
CONFIG_SCHED_STACK_END_CHECK=y
#CONFIG_DEBUG_TIMEKEEPING=y
CONFIG_BUG_ON_DATA_CORRUPTION=y
CONFIG_KFENCE=y
CONFIG_STACK_VALIDATION=y
CONFIG_WQ_WATCHDOG=y
CONFIG_NFT_REJECT_NETDEV=m
CONFIG_SUSPEND=n
CONFIG_HIBERNATION=n
CONFIG_PARAVIRT=n
CONFIG_XEN=n
CONFIG_CLEANCACHE=y
CONFIG_BLK_CGROUP_IOLATENCY=y
CONFIG_SCSI_DEBUG=m
CONFIG_IRQ_TIME_ACCOUNTING=y
CONFIG_SCHED_THERMAL_PRESSURE=y
CONFIG_UCLAMP_TASK=y
CONFIG_UCLAMP_TASK_GROUP=y
CONFIG_IKCONFIG=m
CONFIG_IKCONFIG_PROC=y
CONFIG_RESET_RASPBERRYPI=m
CONFIG_ARM_RASPBERRYPI_CPUFREQ=m
CONFIG_SENSORS_RASPBERRYPI_HWMON=m
CONFIG_TOUCHSCREEN_RASPBERRYPI_FW=m
CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY=m
CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=m
CONFIG_PI433=m
CONFIG_PCIE_BRCMSTB=m

# ARM64 architectures other than RPi
CONFIG_ARCH_N5X=n
CONFIG_ARCH_ACTIONS=n
CONFIG_ARCH_AGILEX=n
CONFIG_ARCH_SUNXI=n
CONFIG_ARCH_ALPINE=n
CONFIG_ARCH_BCM2835=y
CONFIG_ARCH_BCM4908=n
CONFIG_ARCH_BCM_IPROC=n
CONFIG_ARCH_BERLIN=n
CONFIG_ARCH_BITMAIN=n
CONFIG_ARCH_BRCMSTB=n
CONFIG_ARCH_EXYNOS=n
CONFIG_ARCH_SPARX5=n
CONFIG_ARCH_K3=n
CONFIG_ARCH_LAYERSCAPE=n
CONFIG_ARCH_LG1K=n
CONFIG_ARCH_HISI=n
CONFIG_ARCH_KEEMBAY=n
CONFIG_ARCH_MEDIATEK=n
CONFIG_ARCH_MESON=n
CONFIG_ARCH_MVEBU=n
CONFIG_ARCH_MXC=n
CONFIG_ARCH_QCOM=n
CONFIG_ARCH_REALTEK=n
CONFIG_ARCH_RENESAS=n
CONFIG_ARCH_ROCKCHIP=n
CONFIG_ARCH_S32=n
CONFIG_ARCH_SEATTLE=n
CONFIG_ARCH_STRATIX10=n
CONFIG_ARCH_SYNQUACER=n
CONFIG_ARCH_TEGRA=n
CONFIG_ARCH_SPRD=n
CONFIG_ARCH_THUNDER=n
CONFIG_ARCH_THUNDER2=n
CONFIG_ARCH_UNIPHIER=n
CONFIG_ARCH_VEXPRESS=n
CONFIG_ARCH_VISCONTI=n
CONFIG_ARCH_XGENE=n
CONFIG_ARCH_ZX=n
CONFIG_ARCH_ZYNQMP=n
CONFIG_SURFACE_PLATFORMS=n

CONFIG_COMPAT_VDSO=n
CONFIG_DEVMEM=n
CONFIG_DEFAULT_MMAP_MIN_ADDR=32768
CONFIG_KEXEC=n
CONFIG_GCC_PLUGINS=y
CONFIG_GCC_PLUGIN_LATENT_ENTROPY=y
CONFIG_GCC_PLUGIN_STRUCTLEAK=y
CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y
CONFIG_GCC_PLUGIN_STACKLEAK=y
EOF

if [ -t 0 ]; then
  config=oldconfig
else
  config=olddefconfig
fi

if [ `dpkg --print-architecture` = arm64 ]; then
  make ARCH=arm64 KCFLAGS="-march=armv8-a+crc -mtune=cortex-a53" CROSS_COMPILE=aarch64-linux-gnu- CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- $config
else
  make KCFLAGS="-mtune=cortex-a53" $config
fi

if [ -t 0 ]; then
  diff -u .config-orig .config | less
  echo "Hit Enter to proceed."
  read tmp
else
  set +e
  diff -u .config-orig .config
  set -e
fi

# KCFLAGS=-mcpu=cortex-a72+crc for RPi4
# KCFLAGS=-mcpu=cortex-a53+crc for RPi3
# KCFLAGS=-mcpu=cortex-a7 for RPi2

if [ `dpkg --print-architecture` = arm64 ]; then
  make -j 3 ARCH=arm64 KCFLAGS="-march=armv8-a+crc -mtune=cortex-a53" CROSS_COMPILE=aarch64-linux-gnu- CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- bindeb-pkg
else
  make -j 2 KCFLAGS="-mtune=cortex-a53" bindeb-pkg
fi