# git rev-parse -q --verify 3cfdbc2274139bbcc09a44f8aa18d08c0abfd51e^{commit}
3cfdbc2274139bbcc09a44f8aa18d08c0abfd51e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 3cfdbc2274139bbcc09a44f8aa18d08c0abfd51e
# git clean -qxdf
# < git log -1
# commit 3cfdbc2274139bbcc09a44f8aa18d08c0abfd51e
# Author: Arnd Bergmann <arnd@arndb.de>
# Date:   Tue Apr 16 17:33:01 2024 +0200
# 
#     powerpc: drop port I/O helpers for CONFIG_HAS_IOPORT=n
#     
#     Calling inb()/outb() on powerpc when CONFIG_PCI is disabled causes
#     a NULL pointer dereference, which is bad for a number of reasons.
#     
#     After my patch to turn on -Werror in linux-next, this caused a
#     compiler-time warning with clang:
#     
#     In file included from arch/powerpc/include/asm/io.h:672:
#     arch/powerpc/include/asm/io-defs.h:43:1: error: performing pointer
#     arithmetic on a null pointer has undefined behavior
#     [-Werror,-Wnull-pointer-arithmetic]
#        43 | DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
#           | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#        44 |                  (p, b, c), pio, p)
#           |                  ~~~~~~~~~~~~~~~~~~
#     
#     In this configuration, CONFIG_HAS_IOPORT is already disabled, and all
#     drivers that use inb()/outb() should now depend on that (some patches are
#     still in the process of getting marged).
#     
#     Hide all references to inb()/outb() in the powerpc code and the definitions
#     when HAS_IOPORT is disabled to remove the possible NULL pointer access.
#     The same should happin in asm-generic in the near future, but for now
#     the empty inb() macros are still defined to ensure the generic version
#     does not get pulled in.
#     
#     Signed-off-by: Arnd Bergmann <arnd@arndb.de>
#     Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
#     Closes: https://lore.kernel.org/all/CA+G9fYtEh8zmq8k8wE-8RZwW-Qr927RLTn+KqGnq1F=ptaaNsA@mail.gmail.com
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20240416153331.1617772-1-arnd@kernel.org
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 3cfdbc2274139bbcc09a44f8aa18d08c0abfd51e
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-next_defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# Added to kconfig CONFIG_DEBUG_INFO_BTF=n
# Added to kconfig 
# < make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-next_defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-next_defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-  olddefconfig
.config:3751:warning: override: reassigning to symbol DEBUG_INFO_BTF
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-next_defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_defconfig_s390x-gcc8
# Build took: 0:04:33.148461