# git rev-parse -q --verify 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a^{commit}
6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
already have revision, skipping fetch
# git checkout -q -f -B kisskb 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
# git clean -qxdf
# < git log -1
# commit 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
# Author: Gustavo A. R. Silva <gustavoars@kernel.org>
# Date:   Mon Aug 24 15:36:14 2020 -0500
# 
#     lib: Revert use of fallthrough pseudo-keyword in lib/
#     
#     The following build error for powerpc64 was reported by Nathan Chancellor:
#     
#       "$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ
#     
#        $ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
#        ...
#        In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
#                         from arch/powerpc/boot/decompress.c:38:
#        arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
#        arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
#          586 |    fallthrough;
#              |    ^~~~~~~~~~~
#     
#        This will end up affecting distribution configurations such as Debian
#        and OpenSUSE according to my testing. I am not sure what the solution
#        is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure
#        that compiler_attributes.h can be safely included."
#     
#     In order to avoid these sort of problems, it seems that the best
#     solution is to use /* fall through */ comments instead of the
#     fallthrough pseudo-keyword macro in lib/, for now.
#     
#     Reported-by: Nathan Chancellor <natechancellor@gmail.com>
#     Fixes: df561f6688fe ("treewide: Use fallthrough pseudo-keyword")
#     Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
#     Reviewed-and-tested-by: Nathan Chancellor <natechancellor@gmail.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
# < make -s -j 8 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 defconfig
# < make -s -j 8 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help
# make -s -j 8 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig
# make -s -j 8 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
/kisskb/src/arch/um/os-Linux/signal.c: In function 'sig_handler_common':
/kisskb/src/arch/um/os-Linux/signal.c:51:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
/kisskb/src/arch/um/os-Linux/signal.c: In function 'timer_real_alarm_handler':
/kisskb/src/arch/um/os-Linux/signal.c:95:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
  LINK linux
Completed OK
# rm -rf /kisskb/build/linus_um-defconfig_um-x86_64
# Build took: 0:01:02.603077