# git rev-parse -q --verify c826df1217d3744205cac50bb30b3f4269c73d7d^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
# git rev-parse -q --verify c826df1217d3744205cac50bb30b3f4269c73d7d^{commit}
c826df1217d3744205cac50bb30b3f4269c73d7d
# git checkout -q -f -B kisskb c826df1217d3744205cac50bb30b3f4269c73d7d
# git clean -qxdf
# < git log -1
# commit c826df1217d3744205cac50bb30b3f4269c73d7d
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Wed Mar 4 12:20:38 2020 +0900
# 
#     kbuild: allow to run dt_binding_check without kernel configuration
#     
#     The dt_binding_check target is located outside of the
#     'ifneq ($(dtstree),) ... endif' block.
#     
#     So, you can run 'make dt_binding_check' on any architecture.
#     This makes a perfect sense because the dt-schema is arch-agnostic.
#     
#     The only one problem I see is that scripts/dtc/dtc is not always built.
#     For example, ARCH=x86 defconfig does not define CONFIG_DTC. Kbuild
#     descends into scripts/dtc/ with doing nothing. Then, it fails to build
#     *.example.dt.yaml files.
#     
#     Let's build scripts/dtc/dtc forcibly when running dt_binding_check.
#     
#     The dt-schema does not depend on any CONFIG option either, so you
#     should be able to run dt_binding_check without the .config file.
#     
#     Going forward, you can directly run 'make dt_binding_check' in a
#     pristine source tree.
#     
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
#     Reviewed-by: Rob Herring <robh@kernel.org>
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 c826df1217d3744205cac50bb30b3f4269c73d7d
# < make -s -j 8 ARCH=s390 O=/kisskb/build/kbuild_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  defconfig
# < make -s -j 8 ARCH=s390 O=/kisskb/build/kbuild_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 8 ARCH=s390 O=/kisskb/build/kbuild_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  olddefconfig
# make -s -j 8 ARCH=s390 O=/kisskb/build/kbuild_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_s390-defconfig_s390x-gcc4.9
# Build took: 0:05:32.654563