# git rev-parse -q --verify 7bc04ce6b914a06d5823509d1de237787c58e649^{commit}
# git fetch -q -n -f https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/kspp
# git rev-parse -q --verify 7bc04ce6b914a06d5823509d1de237787c58e649^{commit}
7bc04ce6b914a06d5823509d1de237787c58e649
# git checkout -q -f -B kisskb 7bc04ce6b914a06d5823509d1de237787c58e649
# git clean -qxdf
# < git log -1
# commit 7bc04ce6b914a06d5823509d1de237787c58e649
# Author: Gustavo A. R. Silva <gustavoars@kernel.org>
# Date:   Tue Aug 17 15:33:33 2021 -0500
# 
#     Makefile: Enable -Wimplicit-fallthrough for Clang
#     
#     With the recent fixes for fallthrough warnings, it is now possible to
#     enable -Wimplicit-fallthrough for Clang.
#     
#     Special thanks to Nathan Chancellor who fixed the Clang bug[1][2]
#     that put the application of this patch to a halt, temporarily. This
#     bugfix only appears in Clang 14.0.0, so older versions still contain
#     the bug and -Wimplicit-fallthrough won't be enabled for them, for
#     now.
#     
#     As Masahiro noted, the "ifeq" conditional "will break when Clang
#     version 100.0.0 is released. But, before that, we will raise the
#     minimum supported clang version, and this conditional will go away."[3]
#     
#     This concludes a long journey and now we are finally getting rid
#     of the unintentional fallthrough bug-class in the kernel, entirely.
#     
#     [1] https://github.com/llvm/llvm-project/commit/9ed4a94d6451046a51ef393cd62f00710820a7e8
#     [2] https://bugs.llvm.org/show_bug.cgi?id=51094
#     [3] https://lore.kernel.org/lkml/CAK7LNAQFgYgavTP2ZG9Y16XBVdPuJ98J_Ty1OrQy1GXHq6JjQQ@mail.gmail.com/
#     
#     Link: https://github.com/KSPP/linux/issues/115
#     Link: https://github.com/ClangBuiltLinux/linux/issues/236
#     ["firstword" and "sort" was idea of Masahiro]
#     Suggested-by: Masahiro Yamada <masahiroy@kernel.org>
#     [The conditional "ifeq" was idea of Nathan]
#     Suggested-by: Nathan Chancellor <nathan@kernel.org>
#     Reviewed-by: Nathan Chancellor <nathan@kernel.org>
#     Tested-by: Nathan Chancellor <nathan@kernel.org>
#     Co-developed-by: Kees Cook <keescook@chromium.org>
#     Signed-off-by: Kees Cook <keescook@chromium.org>
#     Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-gcc --version
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-ld --version
# < git log --format=%s --max-count=1 7bc04ce6b914a06d5823509d1de237787c58e649
# < make -s -j 24 ARCH=microblaze O=/kisskb/build/gustavoars_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  mmu_defconfig
# < make -s -j 24 ARCH=microblaze O=/kisskb/build/gustavoars_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  help
# make -s -j 24 ARCH=microblaze O=/kisskb/build/gustavoars_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  olddefconfig
# make -s -j 24 ARCH=microblaze O=/kisskb/build/gustavoars_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  
Kernel: arch/microblaze/boot/linux.bin is ready  (#1)
Completed OK
# rm -rf /kisskb/build/gustavoars_mmu_defconfig_microblaze
# Build took: 0:01:18.732893