# git rev-parse -q --verify ea458effa88e4f4739551d76fe3f702daf607995^{commit}
ea458effa88e4f4739551d76fe3f702daf607995
already have revision, skipping fetch
# git checkout -q -f -B kisskb ea458effa88e4f4739551d76fe3f702daf607995
# git clean -qxdf
# < git log -1
# commit ea458effa88e4f4739551d76fe3f702daf607995
# Author: Alastair D'Silva <alastair@d-silva.org>
# Date:   Mon Nov 4 13:32:58 2019 +1100
# 
#     powerpc: Don't flush caches when adding memory
#     
#     This operation takes a significant amount of time when hotplugging
#     large amounts of memory (~50 seconds with 890GB of persistent memory).
#     
#     This was orignally in commit fb5924fddf9e
#     ("powerpc/mm: Flush cache on memory hot(un)plug") to support memtrace,
#     but the flush on add is not needed as it is flushed on remove.
#     
#     Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191104023305.9581-7-alastair@au1.ibm.com
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 ea458effa88e4f4739551d76fe3f702daf607995
# < make -s -j 120 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# make -s -j 120 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8
# Build took: 0:02:31.068914