## /etc/kernels/kernel.conf

## Use uclibc to build smaller initrd
## first do 'crossdev ${ARCH}-pc-linux-uclibc --stage3'
#CTARGET="${CTARGET/-pc-linux-gnu/-pc-linux-uclibc}"

CF(){
	KERNEL_CONFIG="${KERNEL_CONFIG} $*"
}

CPUFLAG(){
	grep "^flags" /proc/cpuinfo | grep -Pq "\s$1[\s\n]"
	return $?
}

#KERNEL_IMAGE_FILES="/bin/mount"

# embed default cmdline
CF CMDLINE_BOOL
# yet another way to configure (KERNEL_CONFIG_*)
: ${KERNEL_CONFIG_CMDLINE:=root=/dev/ram0 init=/linuxrc ramdisk=8192 detect_root vga=0x0f04 quiet zswap.enabled=1 zswap.compressor=lz4}

## ignore errors in modules. may be dangerous
## exclude "stable" branch to avoid system death
[[ "${PN}" != gentoo-* ]] &&  KERNEL_MODULES_MAKEOPT="-i"

## VIA CPU: e_powersaver considered as "dangerous", but you can try (IMHO no bad)
## just: once loaded, do not try to replace by acpi-cpufreq: e_powersaver
## masking MSR speedstep flag (IMHO only reboot)
#CF X86_E_POWERSAVER ACPI_PROCESSOR +X86_ACPI_CPUFREQ
## remove grouping and namespaces, simple role server/desctop
#CF -GROUP_SCHED -CGROUPS -USER_NS -PID_NS -NET_NS
## force >4G RAM & usage on x86_32 (pae required)
#CF HIGHMEM64G HIGHPTE
## <=1G
#CF NOHIGHMEM
## x86_32 faster, no xen, <=4G
#CF -X86_PAE
## may be fatal for ocfs2/drbd
#CF IOSCHED_CFQ DEFAULT_CFQ
## application server: 100HZ
#CF HZ_100
## speedup desktop build
#CF "-.*PCMCIA.* -MCA -EISA"
## remove old IDE (concurrent with ATA)
#CF -IDE
## extensions
CF NETFILTER_XT_MATCH_CONNLIMIT_ACTIVE NETFILTER_XT_TARGET_NOTRACK_NEW NET_SCH_PSP_PKT_GAP NET_SCH_INGRESS_TC2MARK
## I use (PSPacer hard dependend clocks)
CF NET_SCH_PSP_HARDCHAIN

## add maximum overhead & features into U32 classifyers
#CF CLS_U32_MARK NET_CLS_IND CLS_U32_PERF

## additional CFLAGS may be placed here
#KERNEL_CFLAGS="-mtune=native"

## for useflag "custom-arch", very experimental
#KERNEL_CFLAGS="-march=native"

## busybox, etc (size vs. system-wide)
#KERNEL_UTILS_CFLAGS="-march=native -Os -pipe -fomit-frame-pointer -fno-asynchronous-unwind-tables -fno-move-loop-invariants"

## user-mode
#KERNEL_ARCH="um"

## for distro|portable build - both
#[[ "${PN}" == vanilla-* ]] && [[ -n "${CFLAGS##*-march=*}" ]] && KERNEL_ARCH=x86_64
## or
#[[ "${PN}" == vanilla-* ]] && KERNEL_ARCH=x86_64 && KERNEL_CFLAGS+=" -march=nocona -mtune=generic" && CF GENERIC_CPU

#CF MK8
#CF MCORE2

# force (hybrid) 64 bit + all ABIs 
#KERNEL_ARCH=x86 && CF 64BIT IA32_EMULATION X86_X32

## build *config
#KERNEL_MAKE_ADD="Kconfig= menuconfig nconfig gconfig -i"

## dirty fast way to respect CONFIG_CHECK
#KERNEL_RESPECT="nouveau-drm drbd-kernel"

INSTALL_MOD_STRIP="--strip-debug"
#export INSTALL_MOD_STRIP

# use genkernel config, ignore all ebuild configs
#external_kconfig(){ cat /usr/share/genkernel/defaults/kernel*config >"$S"/.config; }

# running config vs. defconfig; faster configure, but possible some entropy (or not?)
#external_kconfig(){ [ -e /proc/config.gz ] && zcat /proc/config.gz >"$S/.config"; false;}