Hi,
this series makes it possible to build bit-identical kernel image and
modules from identical sources. Of course the build is already
deterministic in terms of behavior of the code, but the various
timestamps embedded in the object files make it hard to compare two
builds, for instance to verify that a makefile cleanup didn't
accidentally change something. A prime example is /proc/config.gz, which
has both a timestamp in the gzip header and a timestamp in the payload
data. With this series applied, a script like this will produce
identical kernels each time:
#!/bin/bash
rm -rf /dev/shm/{source,build}{,1,2}
export KCONFIG_NOTIMESTAMP=1
export KBUILD_BUILD_TIMESTAMP='Sun May 1 12:00:00 CEST 2011'
export KBUILD_BUILD_USER=user
export KBUILD_BUILD_HOST=host
export ROOT_DEV=FLOPPY
for i in 1 2; do
mkdir /dev/shm/source
# randomize the inode order just for fun
git ls-tree -r -z --name-only HEAD | sort -R -z | xargs -0 \
cp --parents --target=/dev/shm/source
pushd /dev/shm/source
mkdir /dev/shm/build
>/dev/shm/build/all.config
for opt in GCOV_KERNEL UBIFS_FS_DEBUG; do
echo "# CONFIG_$opt is not set" >>"/dev/shm/build"/all.config
done
make O="/dev/shm/build" KCONFIG_ALLCONFIG=1 allmodconfig
make O="/dev/shm/build" -j64
popd
mv /dev/shm/source /dev/shm/source$i
mv /dev/shm/build /dev/shm/build$i
done
diff -rq /dev/shm/build{1,2}
Unfortunatelly, this cannot be used to validate indentation-only
patches, even if CONFIG_DEBUG_INFO is turned off. This is because of the
__FILE__ and __LINE__ macros used in many places. For the same reason,
the source and build directory needs to be the same, otherwise the
results will differ. This was tested on
x86_64/{defconfig,allmodconfig,allyesconfig} and ppc64/defconfig. The
series is also available at
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6.git
deterministic-build-v1
Michal
Michal Marek (34):
kconfig: Do not record timestamp in auto.conf and autoconf.h
kbuild: Call gzip with -n
powerpc: Call gzip with -n
kbuild: Use the deterministic mode of ar
powerpc: Use the deterministic mode of ar
kbuild: Drop unused LINUX_COMPILE_TIME and LINUX_COMPILE_DOMAIN
macros
kbuild: Allow to override LINUX_COMPILE_BY and LINUX_COMPILE_HOST
macros
initramfs: Use KBUILD_BUILD_TIMESTAMP for generated entries
x86: Allow to override the ROOT_DEV variable
cyclades: Drop __TIME__ usage
nozomi: Drop __TIME__ usage
isdn/diva: Drop __TIME__ usage
media/radio-maxiradio: Drop __TIME__ usage
media/cx231xx: Drop __TIME__ usage
baycom: Drop __TIME__ usage
nand/denali: Drop __TIME__ usage
hdlcdrv: Drop __TIME__ usage
wan/pc300: Drop __TIME__ usage
rt2x00: Drop __TIME__ usage
parport: Drop __TIME__ usage
aacraid: Drop __TIME__ usage
scsi/in2000: Drop __TIME__ usage
scsi/wd33c93: Drop __TIME__ usage
usb/u132-hcd: Drop __TIME__ usage
usb/ftdi-elan: Drop __TIME__ usage
dlm: Drop __TIME__ usage
gfs2: Drop __TIME__ usage
atm: Drop __TIME__ usage
tipc: Drop __TIME__ usage
rio: Drop __DATE__ usage
edac: Drop __DATE__ usage
pmcraid: Drop __DATE__ usage
usb/lh7a40x_udc: Drop __DATE__ usage
checkpatch: Warn about usage of __DATE__, __TIME__ and __TIMESTAMP__
Documentation/kbuild/kbuild.txt | 12 ++++++++++
arch/powerpc/boot/Makefile | 2 +-
arch/powerpc/boot/wrapper | 6 ++--
arch/x86/boot/Makefile | 2 +-
drivers/char/cyclades.c | 3 +-
drivers/char/nozomi.c | 3 +-
drivers/char/rio/rioinit.c | 2 +-
drivers/edac/amd76x_edac.c | 2 +-
drivers/edac/amd8111_edac.c | 2 +-
drivers/edac/amd8131_edac.c | 2 +-
drivers/edac/cpc925_edac.c | 2 +-
drivers/edac/e752x_edac.c | 2 +-
drivers/edac/e7xxx_edac.c | 2 +-
drivers/edac/edac_module.c | 2 +-
drivers/edac/i5000_edac.c | 2 +-
drivers/edac/i5400_edac.c | 2 +-
drivers/edac/i7300_edac.c | 2 +-
drivers/edac/i7core_edac.c | 2 +-
drivers/edac/i82860_edac.c | 2 +-
drivers/edac/i82875p_edac.c | 2 +-
drivers/edac/i82975x_edac.c | 2 +-
drivers/edac/mpc85xx_edac.h | 2 +-
drivers/edac/mv64x60_edac.h | 2 +-
drivers/edac/ppc4xx_edac.c | 2 +-
drivers/edac/r82600_edac.c | 2 +-
drivers/isdn/hardware/eicon/divasfunc.c | 5 +--
drivers/media/radio/radio-maxiradio.c | 3 +-
drivers/media/video/cx231xx/cx231xx-avcore.c | 2 +-
drivers/mtd/nand/denali.c | 3 +-
drivers/net/hamradio/baycom_epp.c | 2 +-
drivers/net/hamradio/baycom_par.c | 2 +-
drivers/net/hamradio/baycom_ser_fdx.c | 2 +-
drivers/net/hamradio/baycom_ser_hdx.c | 2 +-
drivers/net/hamradio/hdlcdrv.c | 2 +-
drivers/net/wan/pc300_drv.c | 3 +-
drivers/net/wireless/rt2x00/rt2x00debug.c | 1 -
drivers/parport/parport_ip32.c | 1 -
drivers/scsi/aacraid/linit.c | 3 +-
drivers/scsi/in2000.c | 2 +-
drivers/scsi/pmcraid.c | 9 +++----
drivers/scsi/pmcraid.h | 1 -
drivers/scsi/wd33c93.c | 7 ++---
drivers/usb/gadget/lh7a40x_udc.c | 7 ++---
drivers/usb/host/u132-hcd.c | 3 +-
drivers/usb/misc/ftdi-elan.c | 3 +-
fs/dlm/main.c | 2 +-
fs/gfs2/main.c | 2 +-
net/atm/lec.c | 2 +-
net/atm/mpc.c | 2 +-
net/tipc/core.c | 3 +-
scripts/Makefile.build | 4 +-
scripts/Makefile.lib | 2 +-
scripts/checkpatch.pl | 5 ++++
scripts/gen_initramfs_list.sh | 8 +++++-
scripts/kconfig/confdata.c | 8 +-----
scripts/mkcompile_h | 30 ++++++++++++-------------
usr/gen_init_cpio.c | 17 +++++++++-----
57 files changed, 109 insertions(+), 105 deletions(-)
--
1.7.4.1
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