# git rev-parse -q --verify 39190ac7cff1fd15135fa8e658030d9646fdb5f2^{commit}
39190ac7cff1fd15135fa8e658030d9646fdb5f2
already have revision, skipping fetch
# git checkout -q -f -B kisskb 39190ac7cff1fd15135fa8e658030d9646fdb5f2
# git clean -qxdf
# < git log -1
# commit 39190ac7cff1fd15135fa8e658030d9646fdb5f2
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon Sep 16 22:05:10 2024 +1000
# 
#     powerpc/atomic: Use YZ constraints for DS-form instructions
#     
#     The 'ld' and 'std' instructions require a 4-byte aligned displacement
#     because they are DS-form instructions. But the "m" asm constraint
#     doesn't enforce that.
#     
#     That can lead to build errors if the compiler chooses a non-aligned
#     displacement, as seen with GCC 14:
#     
#       /tmp/ccuSzwiR.s: Assembler messages:
#       /tmp/ccuSzwiR.s:2579: Error: operand out of domain (39 is not a multiple of 4)
#       make[5]: *** [scripts/Makefile.build:229: net/core/page_pool.o] Error 1
#     
#     Dumping the generated assembler shows:
#     
#       ld 8,39(8)       # MEM[(const struct atomic64_t *)_29].counter, t
#     
#     Use the YZ constraints to tell the compiler either to generate a DS-form
#     displacement, or use an X-form instruction, either of which prevents the
#     build error.
#     
#     See commit 2d43cc701b96 ("powerpc/uaccess: Fix build errors seen with
#     GCC 13/14") for more details on the constraint letters.
#     
#     Fixes: 9f0cbea0d8cc ("[POWERPC] Implement atomic{, 64}_{read, write}() without volatile")
#     Cc: stable@vger.kernel.org # v2.6.24+
#     Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
#     Closes: https://lore.kernel.org/all/20240913125302.0a06b4c7@canb.auug.org.au
#     Tested-by: Mina Almasry <almasrymina@google.com>
#     Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20240916120510.2017749-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 39190ac7cff1fd15135fa8e658030d9646fdb5f2
# make -s -j 40 ARCH=x86_64 O=/kisskb/build/powerpc-next_allmodconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig 
# < make -s -j 40 ARCH=x86_64 O=/kisskb/build/powerpc-next_allmodconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 40 ARCH=x86_64 O=/kisskb/build/powerpc-next_allmodconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 40 ARCH=x86_64 O=/kisskb/build/powerpc-next_allmodconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_allmodconfig_x86_64-gcc8
# Build took: 0:16:41.363412