# git rev-parse -q --verify 15989401e52470508e8d7f73e2264fda2161f679^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
remote: warning: multi-pack bitmap is missing required reverse index        
# git rev-parse -q --verify 15989401e52470508e8d7f73e2264fda2161f679^{commit}
15989401e52470508e8d7f73e2264fda2161f679
# git checkout -q -f -B kisskb 15989401e52470508e8d7f73e2264fda2161f679
# git clean -qxdf
# < git log -1
# commit 15989401e52470508e8d7f73e2264fda2161f679
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Tue Apr 23 01:41:04 2024 +0900
# 
#     kconfig: remove 'optional' property support
#     
#     The 'choice' statement is primarily used to exclusively select one
#     option, but the 'optional' property allows all entries to be disabled.
#     
#     In the following example, both A and B can be disabled simultaneously:
#     
#         choice
#                 prompt "choose A, B, or nothing"
#                 optional
#     
#         config A
#                 bool "A"
#     
#         config B
#                 bool "B"
#     
#         endchoice
#     
#     You can achieve the equivalent outcome by other means.
#     
#     A common solution is to add another option to guard the choice block.
#     In the following example, you can set ENABLE_A_B_CHOICE=n to disable
#     the entire choice block:
#     
#         choice
#                 prompt "choose A or B"
#                 depends on ENABLE_A_B_CHOICE
#     
#         config A
#                 bool "A"
#     
#         config B
#                 bool "B"
#     
#         endchoice
#     
#     Another approach is to insert one more entry:
#     
#         choice
#                 prompt "choose A, B, or disable both"
#     
#         config A
#                 bool "A"
#     
#         config B
#                 bool "B"
#     
#         config DISABLE_A_AND_B
#                 bool "choose this to disable both A and B"
#     
#         endchoice
#     
#     Some real examples are DEBUG_INFO_NONE, INITRAMFS_COMPRESSION_NONE,
#     LTO_NONE, etc.
#     
#     The 'optional' property is even more unnecessary for a tristate choice.
#     
#     Without the 'optional' property, you can disable A and B; you can set
#     'm' in the choice prompt, and disable A and B individually:
#     
#         choice
#                 prompt "choose one built-in or make them modular"
#     
#         config A
#                 tristate "A"
#     
#         config B
#                 tristate "B"
#     
#         endchoice
#     
#     In conclusion, the 'optional' property was unneeded.
#     
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
#     Reviewed-by: Nicolas Schier <n.schier@avm.de>
# < /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 15989401e52470508e8d7f73e2264fda2161f679
# make -s -j 160 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# Added to kconfig CONFIG_SMP=y
# < make -s -j 160 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 160 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:4524:warning: override: reassigning to symbol SMP
# make -s -j 160 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5
# Build took: 0:01:59.877231