# git rev-parse -q --verify 8d17c0c83c07bad137e2df3a45e9cd4e80d85418^{commit}
8d17c0c83c07bad137e2df3a45e9cd4e80d85418
already have revision, skipping fetch
# git checkout -q -f -B kisskb 8d17c0c83c07bad137e2df3a45e9cd4e80d85418
# git clean -qxdf
# < git log -1
# commit 8d17c0c83c07bad137e2df3a45e9cd4e80d85418
# Author: Ard Biesheuvel <ardb@kernel.org>
# Date:   Wed Oct 28 09:04:33 2020 +0100
# 
#     powerpc: Avoid broken GCC __attribute__((optimize))
#     
#     Commit 7053f80d9696 ("powerpc/64: Prevent stack protection in early
#     boot") introduced a couple of uses of __attribute__((optimize)) with
#     function scope, to disable the stack protector in some early boot
#     code.
#     
#     Unfortunately, and this is documented in the GCC man pages [0],
#     overriding function attributes for optimization is broken, and is only
#     supported for debug scenarios, not for production: the problem appears
#     to be that setting GCC -f flags using this method will cause it to
#     forget about some or all other optimization settings that have been
#     applied.
#     
#     So the only safe way to disable the stack protector is to disable it
#     for the entire source file.
#     
#     [0] https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
#     
#     Fixes: 7053f80d9696 ("powerpc/64: Prevent stack protection in early boot")
#     Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
#     [mpe: Drop one remaining use of __nostackprotector, reported by snowpatch]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20201028080433.26799-1-ardb@kernel.org
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 8d17c0c83c07bad137e2df3a45e9cd4e80d85418
# < make -s -j 120 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# make -s -j 120 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  
error: section .boot.data differs between vmlinux and arch/s390/boot/compressed/vmlinux
make[2]: *** [/kisskb/src/arch/s390/boot/Makefile:65: arch/s390/boot/section_cmp.boot.data] Error 1
make[2]: *** Waiting for unfinished jobs....
error: section .boot.preserved.data differs between vmlinux and arch/s390/boot/compressed/vmlinux
make[2]: *** [/kisskb/src/arch/s390/boot/Makefile:65: arch/s390/boot/section_cmp.boot.preserved.data] Error 1
make[1]: *** [arch/s390/Makefile:153: bzImage] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:185: __sub-make] Error 2
Command 'make -s -j 120 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-next_s390-defconfig_s390x-gcc8
# Build took: 0:02:45.031651