# 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/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  mpc85xx_defconfig
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/include/linux/kernel.h:11:0,
                 from /kisskb/src/include/linux/list.h:9,
                 from /kisskb/src/include/linux/module.h:12,
                 from /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:15:
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd':
/kisskb/src/include/linux/err.h:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
                                                 ^
/kisskb/src/include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
 # define unlikely(x) __builtin_expect(!!(x), 0)
                                          ^
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:6: note: in expansion of macro 'IS_ERR_VALUE'
  if (IS_ERR_VALUE(fep->ring_mem_addr))
      ^
cc1: fatal error: opening output file arch/powerpc/boot/dts/fsl/.mpc8540ads.dtb.dts.tmp: No such file or directory
compilation terminated.
make[2]: *** [scripts/Makefile.lib:326: arch/powerpc/boot/dts/fsl/mpc8540ads.dtb] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [arch/powerpc/Makefile:295: zImage] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:185: __sub-make] Error 2
Command 'make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus_mpc85xx_defconfig_powerpc-gcc4.9
# Build took: 0:03:56.028178