# git rev-parse -q --verify 67963d8b5ca5694b88927f3a68bb9198be25e8d9^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-stable-rc.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 67963d8b5ca5694b88927f3a68bb9198be25e8d9^{commit}
67963d8b5ca5694b88927f3a68bb9198be25e8d9
# git checkout -q -f -B kisskb 67963d8b5ca5694b88927f3a68bb9198be25e8d9
# git clean -qxdf
# < git log -1
# commit 67963d8b5ca5694b88927f3a68bb9198be25e8d9
# Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Date:   Thu Jan 24 20:02:08 2019 +0100
# 
#     Linux 4.20.5-rc1
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-ld --version
# < git log --format=%s --max-count=1 67963d8b5ca5694b88927f3a68bb9198be25e8d9
# < make -s -j 48 ARCH=i386 O=/kisskb/build/stable-rc-4.20_i386_defconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  i386_defconfig
# make -s -j 48 ARCH=i386 O=/kisskb/build/stable-rc-4.20_i386_defconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  
You are building kernel with non-retpoline compiler.
Please update your compiler.
make[1]: *** [arch/x86/Makefile:304: checkbin] Error 1
make: *** [Makefile:152: sub-make] Error 2
Command 'make -s -j 48 ARCH=i386 O=/kisskb/build/stable-rc-4.20_i386_defconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/stable-rc-4.20_i386_defconfig_i386
# Build took: 0:00:32.634900