# git rev-parse -q --verify e4b79900222b8cccd4da4a7a89581f0e1b764ed2^{commit}
e4b79900222b8cccd4da4a7a89581f0e1b764ed2
already have revision, skipping fetch
# git checkout -q -f -B kisskb e4b79900222b8cccd4da4a7a89581f0e1b764ed2
# git clean -qxdf
# < git log -1
# commit e4b79900222b8cccd4da4a7a89581f0e1b764ed2
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Tue Mar 13 15:58:11 2018 +1100
# 
#     powerpc/64s: Fix NULL AT_BASE_PLATFORM when using DT CPU features
#     
#     When running virtualised the powerpc kernel is able to run the system
#     in "compat mode" - which means the kernel and hardware are pretending
#     to userspace that the CPU is an older version than it actually is.
#     
#     AT_BASE_PLATFORM is an AUXV entry that we export to userspace for use
#     when we're running in that mode, which tells userspace the "platform"
#     string for the real CPU version, as opposed to the faked version.
#     
#     Although we don't support compat mode when using DT CPU features, and
#     arguably don't need to set AT_BASE_PLATFORM, the existing cputable
#     based code always sets it even when we're running bare metal. That
#     means the lack of AT_BASE_PLATFORM is a user-visible artifact of the
#     fact that the kernel is using DT CPU features, which we don't want.
#     
#     So set it in the DT CPU features code also.
#     
#     This results in eg:
#       $ LD_SHOW_AUXV=1 /bin/true | grep "AT_.*PLATFORM"
#       AT_PLATFORM:     power9
#       AT_BASE_PLATFORM:power9
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 e4b79900222b8cccd4da4a7a89581f0e1b764ed2
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  85xx/mpc8540_ads_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x486088) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
INFO: Uncompressed kernel (size 0x475a44) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-4.16.0-rc2-ge4b7990
Created:      Wed Mar 14 22:49:50 2018
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2343836 Bytes = 2288.90 kB = 2.24 MB
Load Address: 00000000
Entry Point:  00000000
Image Name:   Linux-4.16.0-rc2-ge4b7990
Created:      Wed Mar 14 22:49:51 2018
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2367361 Bytes = 2311.88 kB = 2.26 MB
Load Address: 00500000
Entry Point:  0050020c
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-5.3
# Build took: 0:01:41.121763