# git rev-parse -q --verify bb9b03013f62e8f3a6297de1bf63e0009ea21cd8^{commit}
bb9b03013f62e8f3a6297de1bf63e0009ea21cd8
already have revision, skipping fetch
# git checkout -q -f -B kisskb bb9b03013f62e8f3a6297de1bf63e0009ea21cd8
# git clean -qxdf
# < git log -1
# commit bb9b03013f62e8f3a6297de1bf63e0009ea21cd8
# Merge: fe094c75d9d5 baf5fe761846
# Author: Ingo Molnar <mingo@kernel.org>
# Date:   Wed Mar 25 12:03:34 2020 +0100
# 
#     Merge branch 'core/rcu'
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 bb9b03013f62e8f3a6297de1bf63e0009ea21cd8
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/tip_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  powernv_defconfig
# Added to kconfig CONFIG_PERF_EVENTS=n
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/tip_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 48 ARCH=powerpc O=/kisskb/build/tip_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/tip_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
WARNING: vmlinux.o(.text+0x2fc8): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init 
annotation or the annotation of start_kernel is wrong.

Completed OK
# rm -rf /kisskb/build/tip_powernv_defconfig+NO_PERF_powerpc-gcc5
# Build took: 0:02:55.944138