# 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_pmac32_defconfig+SMP_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# Added to kconfig CONFIG_SMP=y
# yes \n | make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/sound/ppc/pmac.h:25:0,
                 from /kisskb/src/sound/ppc/awacs.c:29:
/kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:220:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return _snd_ctl_add_slave(master, slave, 0);
         ^
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
  struct snd_kcontrol *master_vol, *speaker_vol;
                                    ^
WARNING: modpost: Found 1 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
INFO: Uncompressed kernel (size 0x900230) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0xa00000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc-5.3
# Build took: 0:01:35.985694