# git rev-parse -q --verify a24e06a3db44b45dbfab067b7e36b4c54efaeeb9^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
# git rev-parse -q --verify a24e06a3db44b45dbfab067b7e36b4c54efaeeb9^{commit}
a24e06a3db44b45dbfab067b7e36b4c54efaeeb9
# git checkout -q -f -B kisskb a24e06a3db44b45dbfab067b7e36b4c54efaeeb9
# git clean -qxdf
# < git log -1
# commit a24e06a3db44b45dbfab067b7e36b4c54efaeeb9
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Thu May 5 16:22:35 2022 +0900
# 
#     kbuild: record symbol versions in *.cmd files
#     
#     When CONFIG_MODVERSIONS=y, the output from genksyms is saved in
#     separate *.symversions files, and will be used much later when
#     CONFIG_LTO_CLANG=y because it is impossible to update LLVM bit code
#     here.
#     
#     This approach is not robust because:
#     
#      - *.symversions may or may not exist. If *.symversions does not
#        exist, we never know if it is missing for legitimate reason
#        (i.e. no EXPORT_SYMBOL) or something bad has happened (for
#        example, the user accidentally deleted it). Once it occurs,
#        it is not self-healing because *.symversions is generated
#        as a side effect.
#     
#      - stale (i.e. invalid) *.symversions might be picked up if an
#        object is generated in a non-ordinary way, and corresponding
#        *.symversions (, which was generated by old builds) just happen
#        to exist.
#     
#     A more robust approach is to save symbol versions in *.cmd files
#     because:
#     
#      - *.cmd always exists (if the object is generated by if_changed
#        rule or friends). Even if the user accidentally deletes it,
#        it will be regenerated in the next build.
#     
#      - *.cmd is always re-generated when the object is updated. This
#        avoid stale version information being picked up.
#     
#     I will remove *.symversions later.
#     
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
#     Tested-by: Nicolas Schier <nicolas@fjasle.eu>
#     Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
#     Tested-by: Nathan Chancellor <nathan@kernel.org>
# < /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 a24e06a3db44b45dbfab067b7e36b4c54efaeeb9
# < make -s -j 32 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 32 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 32 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 32 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: 0:04:58.237827