Hi Tixy,
I tried to build the linaro IKS kernel (taken from big.LITTLE-IKS-snapshot), but I saw following warnings of missing config options. Are those expected, or did I do anything wrong?
Eric H.
>>>>>>
~/work/build/linaro_iks$./build.sh
Using linaro/configs/linaro-base.conf as base
Merging linaro/configs/android.conf
Merging linaro/configs/big-LITTLE-MP.conf
Merging linaro/configs/big-LITTLE-IKS.conf
Merging linaro/configs/vexpress.conf
scripts/kconfig/conf --alldefconfig Kconfig
./.tmp.config.fLRIDDSFsS:115:warning: override: CPU_FREQ_DEFAULT_GOV_INTERACTIVE changes choice state
./.tmp.config.fLRIDDSFsS:144:warning: override: CPU_FREQ_DEFAULT_GOV_PERFORMANCE changes choice state
#
# configuration written to .config
#
Value requested for CONFIG_OABI_COMPAT not in final .config
Requested value: # CONFIG_OABI_COMPAT is not set
Actual value:
Value requested for CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND not in final .config
Requested value: CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
Actual value: # CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
Value requested for CONFIG_ENABLE_DEFAULT_TRACERS not in final .config
Requested value: CONFIG_ENABLE_DEFAULT_TRACERS=y
Actual value:
Value requested for CONFIG_USB_G_ANDROID not in final .config
Requested value: CONFIG_USB_G_ANDROID=y
Actual value:
Value requested for CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE not in final .config
Requested value: CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE=y
Actual value: # CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE is not set
scripts/kconfig/conf --silentoldconfig Kconfig
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
make[1]: `include/generated/mach-types.h' is up to date.
CALL scripts/checksyscalls.sh
CC scripts/mod/devicetable-offsets.s
GEN scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
HOSTLD scripts/mod/modpost
CHK include/generated/compile.h
HZFILE kernel/hz.bc
BC kernel/timeconst.h
CC kernel/time.o
GZIP kernel/config_data.gz
CHK kernel/config_data.h
LD kernel/built-in.o
LINK vmlinux
LD vmlinux.o
MODPOST vmlinux.o
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
KSYM .tmp_kallsyms1.o
KSYM .tmp_kallsyms2.o
LD vmlinux
SORTEX vmlinux
SYSMAP System.map
OBJCOPY arch/arm/boot/Image
Kernel: arch/arm/boot/Image is ready
GZIP arch/arm/boot/compressed/piggy.gzip
AS arch/arm/boot/compressed/piggy.gzip.o
LD arch/arm/boot/compressed/vmlinux
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready
UIMAGE arch/arm/boot/uImage
Image Name: Linux-3.9.0-rc7-00862-g1d6eaf2-d
Created: Sun May 5 12:20:26 2013
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3768896 Bytes = 3680.56 kB = 3.59 MB
Load Address: 80008000
Entry Point: 80008000
Begin forwarded message:
Subject: The Linaro IKS code now publicly available
Date: May 1, 2013 12:33:38 PM MDT
I'm delighted to announce that the Linaro Technical Steering Committee
has approved the release of the big.LITTLE in-kernel switcher (IKS) code
to the public.
So here it is:
Branch big.LITTLE-IKS-snapshot of
git://git.linaro.org/landing-teams/working/arm/kernel.gitAlthough this is a snapshot of our latest IKS code, it still needs some
minor tidying before it is submitted upstream. So please consider the
above as a temporary branch for people to look and play with, and not a
branch that we'll keep stable and maintain.
This code was also developed for and tested on the VExpress TC2
development platform. An MCPM backend and possibly a special cpufreq
clock driver are required for this code to be usable on other platforms.
The switcher concept is discussed here:
http://lwn.net/Articles/481055/
Porting documentation is available here:
https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/porting-guide
The switcher code description is available here (slightly out of date):
https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/in-kernel-code
And a review of the MCPM layer upon which IKS and HMP rely:
http://lwn.net/Articles/539082/
The core MCPM patches are queued for inclusion into the v3.10 mainline
kernel. The MCPM backend for TC2 and the IKS patches will tentatively
be submitted for v3.11.
Nicolas
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