# git rev-parse -q --verify c4d7f40b250c1a4d74ed259e84807f58032507b6^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
warning: 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 c4d7f40b250c1a4d74ed259e84807f58032507b6^{commit}
c4d7f40b250c1a4d74ed259e84807f58032507b6
# git checkout -q -f -B kisskb c4d7f40b250c1a4d74ed259e84807f58032507b6
# git clean -qxdf
# < git log -1
# commit c4d7f40b250c1a4d74ed259e84807f58032507b6
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Mon Jan 10 03:15:29 2022 +0900
# 
#     kbuild: add cmd_file_size
#     
#     Some architectures support self-extracting kernel, which embeds the
#     compressed vmlinux.
#     
#     It has 4 byte data at the end so the decompressor can know the vmlinux
#     size beforehand.
#     
#     GZIP natively has it in the trailer, but for the other compression
#     algorithms, the hand-crafted trailer is added.
#     
#     It is unneeded to generate such _corrupted_ compressed files because
#     it is possible to pass the size data as a separate file.
#     
#     For example, the assembly code:
#     
#          .incbin "compressed-vmlinux-with-size-data"
#     
#     can be transformed to:
#     
#          .incbin "compressed-vmlinux"
#          .incbin "size-data"
#     
#     My hope is, after some reworks of the decompressors, the macros
#     cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22}_with_size will go away.
#     
#     This new macro, cmd_file_size, will be useful to generate a separate
#     size-data file.
#     
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
#     Reviewed-by: Nicolas Schier <n.schier@avm.de>
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 c4d7f40b250c1a4d74ed259e84807f58032507b6
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  defconfig
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  help
# make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  olddefconfig
# make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_arm64-defconfig_arm64-gcc11
# Build took: 0:07:58.862203