# git rev-parse -q --verify af0df68432f65915b2a316aa99eeeb588d4c65a2^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-stable.git linux-4.20.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 af0df68432f65915b2a316aa99eeeb588d4c65a2^{commit}
af0df68432f65915b2a316aa99eeeb588d4c65a2
# git checkout -q -f -B kisskb af0df68432f65915b2a316aa99eeeb588d4c65a2
# git clean -qxdf
# < git log -1
# commit af0df68432f65915b2a316aa99eeeb588d4c65a2
# Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Date:   Wed Mar 13 14:04:20 2019 -0700
# 
#     Linux 4.20.16
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 af0df68432f65915b2a316aa99eeeb588d4c65a2
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/stable-4.20_powerpc-allnoconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  allnoconfig
# make -s -j 10 ARCH=powerpc O=/kisskb/build/stable-4.20_powerpc-allnoconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/stable-4.20_powerpc-allnoconfig_powerpc-gcc4.6
# Build took: 0:00:51.920365