# git gc
# git rev-parse -q --verify 4c0fe77545077b5052b645b28b73f3c759b4ba03^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/stable linux-4.9.y
# git rev-parse -q --verify 4c0fe77545077b5052b645b28b73f3c759b4ba03^{commit}
4c0fe77545077b5052b645b28b73f3c759b4ba03
# git checkout -q -f -B kisskb 4c0fe77545077b5052b645b28b73f3c759b4ba03
# git clean -qxdf
# < git log -1
# commit 4c0fe77545077b5052b645b28b73f3c759b4ba03
# Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Date:   Sun Sep 26 13:36:19 2021 +0200
# 
#     Linux 4.9.284
#     
#     Link: https://lore.kernel.org/r/20210924124328.336953942@linuxfoundation.org
#     Tested-by: Jon Hunter <jonathanh@nvidia.com>
#     Tested-by: Shuah Khan <skhan@linuxfoundation.org>
#     Tested-by: Florian Fainelli <f.fainelli@gmail.com>
#     Link: https://lore.kernel.org/r/20210925120744.599320551@linuxfoundation.org
#     Tested-by: Guenter Roeck <linux@roeck-us.net>
#     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# < /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 4c0fe77545077b5052b645b28b73f3c759b4ba03
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/stable-4.9_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/stable-4.9_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/stable-4.9_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/stable-4.9_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/setup_64.c: In function 'rfi_flush_debugfs_init':
/kisskb/src/arch/powerpc/kernel/setup_64.c:921:41: error: 'powerpc_debugfs_root' undeclared (first use in this function)
  debugfs_create_file("rfi_flush", 0600, powerpc_debugfs_root, NULL, &fops_rfi_flush);
                                         ^
/kisskb/src/arch/powerpc/kernel/setup_64.c:921:41: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [/kisskb/src/scripts/Makefile.build:307: arch/powerpc/kernel/setup_64.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1036: arch/powerpc/kernel] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:152: sub-make] Error 2
Command 'make -s -j 48 ARCH=powerpc O=/kisskb/build/stable-4.9_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/stable-4.9_powernv_defconfig+NO_PERF_powerpc-gcc5
# Build took: 0:07:00.905965