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synced 2025-09-11 16:51:18 +02:00
51b300ebdf
- turns out `pahole` for `vmlinux` can take multiple gigabytes of RAM to run successfully - I can't simply decide based on available RAM, as that would make .config hashes mismatch - thus, introduce: - default is to enable BTF; if on low-ram host, error out unless KERNEL_BTF=yes is passed - if KERNEL_BTF=no is passed, the BTF debug info is always disabled - if KERNEL_BTF=yes is passed, then a warning is produced, but BTF is still enabled - the magic number "6451 MiB" was determined empirically (and is probably bs)
198 lines
9.0 KiB
Bash
198 lines
9.0 KiB
Bash
#!/usr/bin/env bash
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#
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (c) 2013-2023 Igor Pecovnik, igor@armbian.com
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#
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# This file is a part of the Armbian Build Framework
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# https://github.com/armbian/build/
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# Forced .config options for all Armbian kernels.
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# Please note: Manually changing options doesn't check the validity of the .config file. This is done at next make time. Check for warnings in build log.
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# This is an internal/core extension.
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function armbian_kernel_config__extrawifi_enable_wifi_opts_80211() {
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if linux-version compare "${KERNEL_MAJOR_MINOR}" ge 6.13; then
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kernel_config_modifying_hashes+=("CONFIG_CFG80211=m" "CONFIG_MAC80211=m" "CONFIG_MAC80211_MESH=y" "CONFIG_CFG80211_WEXT=y")
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if [[ -f .config ]]; then
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# Required by many wifi drivers; otherwise "error: 'struct net_device' has no member named 'ieee80211_ptr'"
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# In 6.13 something changed ref CONFIG_MAC80211 and CONFIG_CFG80211; enable both to preserve wireless drivers
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kernel_config_set_m CONFIG_CFG80211
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kernel_config_set_m CONFIG_MAC80211
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kernel_config_set_y CONFIG_MAC80211_MESH
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kernel_config_set_y CONFIG_CFG80211_WEXT
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fi
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fi
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}
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function armbian_kernel_config__disable_various_options() {
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kernel_config_modifying_hashes+=("CONFIG_MODULE_COMPRESS_NONE=y" "CONFIG_MODULE_SIG=n" "CONFIG_LOCALVERSION_AUTO=n" "EXPERT=y")
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if [[ -f .config ]]; then
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display_alert "Enable CONFIG_EXPERT=y" "armbian-kernel" "debug"
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kernel_config_set_y EXPERT # Too many config options are hidden behind EXPERT=y, lets have it always on
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display_alert "Disabling module compression and signing / debug / auto version" "armbian-kernel" "debug"
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# DONE: Disable: signing, and compression of modules, for speed.
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kernel_config_set_n CONFIG_MODULE_COMPRESS_XZ # No use double-compressing modules
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kernel_config_set_n CONFIG_MODULE_COMPRESS_ZSTD
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kernel_config_set_n CONFIG_MODULE_COMPRESS_GZIP
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if linux-version compare "${KERNEL_MAJOR_MINOR}" ge 6.12; then
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kernel_config_set_n CONFIG_MODULE_COMPRESS # Introduced in 6.12 (see https://github.com/torvalds/linux/commit/c7ff693fa2094ba0a9d0a20feb4ab1658eff9c33)
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elif linux-version compare "${KERNEL_MAJOR_MINOR}" ge 6.0; then
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kernel_config_set_y CONFIG_MODULE_COMPRESS_NONE # Introduced in 6.0
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else
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kernel_config_set_n CONFIG_MODULE_COMPRESS # Only available up to 5.12
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fi
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kernel_config_set_n CONFIG_SECURITY_LOCKDOWN_LSM
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kernel_config_set_n CONFIG_MODULE_SIG # No use signing modules
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kernel_config_set_n CONFIG_MODULE_SIG_ALL # No use auto-signing modules
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kernel_config_set_n MODULE_SIG_FORCE # No forcing of module sign verification
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kernel_config_set_n IMA_APPRAISE_MODSIG # No appraisal module-style either
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# DONE: Disable: version shenanigans
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kernel_config_set_n CONFIG_LOCALVERSION_AUTO # This causes a mismatch between what Armbian wants and what make produces.
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kernel_config_set_string CONFIG_LOCALVERSION '""' # Must be empty; make is later invoked with LOCALVERSION and it adds up
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fi
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}
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function armbian_kernel_config__force_pa_va_48_bits_on_arm64() {
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declare -A opts_val=()
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declare -a opts_y=() opts_n=()
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if [[ "${ARCH}" == "arm64" ]]; then
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opts_y+=("CONFIG_ARM64_VA_BITS_48")
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opts_val["CONFIG_ARM64_PA_BITS"]="48"
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fi
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armbian_kernel_config_apply_opts_from_arrays
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}
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function armbian_kernel_config__600_enable_ebpf_and_btf_info() {
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declare -A opts_val=()
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declare -a opts_y=() opts_n=()
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if [[ "${KERNEL_BTF}" == "no" ]]; then # If user is explicit by passing "KERNEL_BTF=no", then actually disable all debug info.
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display_alert "Disabling eBPF and BTF info for kernel" "as requested by KERNEL_BTF=no" "info"
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opts_y+=("CONFIG_DEBUG_INFO_NONE") # Enable the "none" option
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opts_n+=("CONFIG_DEBUG_INFO" "CONFIG_DEBUG_INFO_DWARF5" "CONFIG_DEBUG_INFO_BTF" "CONFIG_DEBUG_INFO_BTF_MODULES") # BTF & CO-RE == off
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# We don't disable the eBPF options, as eBPF itself doesn't require BTF (debug info) and doesnt' consume as much memory during build as BTF debug info does.
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else
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declare -i available_physical_memory_mib
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available_physical_memory_mib=$(($(awk '/MemAvailable/ {print $2}' /proc/meminfo) / 1024)) # MiB
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display_alert "Considering available RAM for BTF build" "${available_physical_memory_mib} MiB" "info"
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if [[ ${available_physical_memory_mib} -lt 6451 ]]; then # If less than 6451 MiB of RAM is available, then exit with an error, telling the user to avoid pain and set KERNEL_BTF=no ...
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if [[ "${KERNEL_BTF}" == "yes" ]]; then # ... except if the user knows better, and has set KERNEL_BTF=yes, then we'll just warn.
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display_alert "Not enough RAM available (${available_physical_memory_mib}Mib) for BTF build" "but KERNEL_BTF=yes is set; enabling BTF" "warn"
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else
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exit_with_error "Not enough RAM available (${available_physical_memory_mib}Mib) for BTF build. Please set 'KERNEL_BTF=no' to avoid running out of memory during the kernel LD/BTF build step; or ignore this check by setting 'KERNEL_BTF=yes' -- that might put a lot of load on your swap disk, if any."
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fi
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fi
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display_alert "Enabling eBPF and BTF info" "for fully BTF & CO-RE enabled kernel" "info"
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opts_n+=("CONFIG_DEBUG_INFO_NONE") # Make sure the "none" option is disabled
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opts_y+=(
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"CONFIG_BPF_JIT" "CONFIG_BPF_JIT_DEFAULT_ON" "CONFIG_FTRACE_SYSCALLS" "CONFIG_PROBE_EVENTS_BTF_ARGS" "CONFIG_BPF_KPROBE_OVERRIDE" # eBPF == on
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"CONFIG_DEBUG_INFO" "CONFIG_DEBUG_INFO_DWARF5" "CONFIG_DEBUG_INFO_BTF" "CONFIG_DEBUG_INFO_BTF_MODULES" # BTF & CO-RE == off
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)
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fi
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armbian_kernel_config_apply_opts_from_arrays
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return 0
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}
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function armbian_kernel_config__enable_config_access_in_live_system() {
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kernel_config_modifying_hashes+=("CONFIG_IKCONFIG_PROC=y")
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if [[ -f .config ]]; then
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kernel_config_set_y CONFIG_IKCONFIG # This information can be extracted from the kernel image file with the script scripts/extract-ikconfig and used as input to rebuild the current kernel or to build another kernel
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kernel_config_set_y CONFIG_IKCONFIG_PROC # This option enables access to the kernel configuration file through /proc/config.gz
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fi
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}
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function armbian_kernel_config__restore_enable_gpio_sysfs() {
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kernel_config_modifying_hashes+=("CONFIG_GPIO_SYSFS=y")
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if [[ -f .config ]]; then
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kernel_config_set_y CONFIG_GPIO_SYSFS # This was a victim of not having EXPERT=y due to some _DEBUG conflicts in old times. Re-enable it forcefully.
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fi
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}
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# +++++++++++ HELPERS CORNER +++++++++++
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#
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# Helpers for manipulating kernel config.
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#
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function kernel_config_set_m() {
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declare module="$1"
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display_alert "Enabling kernel module" "${module}=m" "debug"
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run_host_command_logged ./scripts/config --module "$module"
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}
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function kernel_config_set_y() {
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declare config="$1"
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display_alert "Enabling kernel config/built-in" "${config}=y" "debug"
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run_host_command_logged ./scripts/config --enable "${config}"
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}
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function kernel_config_set_n() {
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declare config="$1"
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display_alert "Disabling kernel config/module" "${config}=n" "debug"
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# Only set to "n" if the config option can be found in the config file.
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# Otherwise the option would maybe be considered as misconfiguration.
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if grep -qE "(\b${config}\=|CONFIG_${config}\=)" .config; then
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run_host_command_logged ./scripts/config --disable "${config}"
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elif grep -qE "(\b${config} is not set|\bCONFIG_${config} is not set)" .config; then
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display_alert "Kernel config/module was already disabled" "${config}=n skipped" "debug"
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else
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display_alert "Kernel config/module was not found in the config file" "${config}=n was not added to prevent misconfiguration" "debug"
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fi
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}
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function kernel_config_set_string() {
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declare config="$1"
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declare value="${2}"
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display_alert "Setting kernel config/module string" "${config}=${value}" "debug"
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run_host_command_logged ./scripts/config --set-str "${config}" "${value}"
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}
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function kernel_config_set_val() {
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declare config="$1"
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declare value="${2}"
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display_alert "Setting kernel config/module value" "${config}=${value}" "debug"
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run_host_command_logged ./scripts/config --set-val "${config}" "${value}"
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}
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# This takes opts_n, opts_y, arrays from parent scope; also the opts_val dictionary;
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# it and applies them to the hashes and to the .config if it exists.
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function armbian_kernel_config_apply_opts_from_arrays() {
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declare opt_y opt_val opt_n
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for opt_n in "${opts_n[@]}"; do
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kernel_config_modifying_hashes+=("${opt_n}=n")
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done
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for opt_y in "${opts_y[@]}"; do
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kernel_config_modifying_hashes+=("${opt_y}=y")
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done
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for opt_val in "${!opts_val[@]}"; do
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kernel_config_modifying_hashes+=("${opt_val}=${opts_val[$opt_val]}")
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done
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if [[ -f .config ]]; then
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for opt_n in "${opts_n[@]}"; do
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display_alert "Disabling kernel opt" "${opt_n}=n" "debug"
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kernel_config_set_n "${opt_n}"
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done
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for opt_y in "${opts_y[@]}"; do
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display_alert "Enabling kernel opt" "${opt_y}=y" "debug"
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kernel_config_set_y "${opt_y}"
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done
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for opt_val in "${!opts_val[@]}"; do
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display_alert "Setting kernel opt" "${opt_val}=${opts_val[$opt_val]}" "debug"
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kernel_config_set_val "${opt_val}" "${opts_val[$opt_val]}"
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done
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fi
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}
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