# git rev-parse -q --verify badcc565e126a82d71489937307bf06c426725a9^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/stable linux-4.9.y
error: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify badcc565e126a82d71489937307bf06c426725a9^{commit}
badcc565e126a82d71489937307bf06c426725a9
# git checkout -q -f -B kisskb badcc565e126a82d71489937307bf06c426725a9
# git clean -qxdf
# < git log -1
# commit badcc565e126a82d71489937307bf06c426725a9
# Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Date:   Sat Feb 23 09:05:59 2019 +0100
# 
#     Linux 4.9.160
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 badcc565e126a82d71489937307bf06c426725a9
# < make -s -j 120 ARCH=arm64 O=/kisskb/build/stable-4.9_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 120 ARCH=arm64 O=/kisskb/build/stable-4.9_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
Completed OK
# rm -rf /kisskb/build/stable-4.9_arm64-defconfig_arm64-gcc5.4
# Build took: 0:03:36.830234