# git rev-parse -q --verify 21a741eb75f80397e5f7d3739e24d7d75e619011^{commit}
21a741eb75f80397e5f7d3739e24d7d75e619011
already have revision, skipping fetch
# git checkout -q -f -B kisskb 21a741eb75f80397e5f7d3739e24d7d75e619011
# git clean -qxdf
# < git log -1
# commit 21a741eb75f80397e5f7d3739e24d7d75e619011
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Tue Jun 25 23:40:47 2024 +1000
# 
#     powerpc/pseries: Fix scv instruction crash with kexec
#     
#     kexec on pseries disables AIL (reloc_on_exc), required for scv
#     instruction support, before other CPUs have been shut down. This means
#     they can execute scv instructions after AIL is disabled, which causes an
#     interrupt at an unexpected entry location that crashes the kernel.
#     
#     Change the kexec sequence to disable AIL after other CPUs have been
#     brought down.
#     
#     As a refresher, the real-mode scv interrupt vector is 0x17000, and the
#     fixed-location head code probably couldn't easily deal with implementing
#     such high addresses so it was just decided not to support that interrupt
#     at all.
#     
#     Fixes: 7fa95f9adaee ("powerpc/64s: system call support for scv/rfscv instructions")
#     Cc: stable@vger.kernel.org # v5.9+
#     Reported-by: Sourabh Jain <sourabhjain@linux.ibm.com>
#     Closes: https://lore.kernel.org/3b4b2943-49ad-4619-b195-bc416f1d1409@linux.ibm.com
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Tested-by: Gautam Menghani <gautam@linux.ibm.com>
#     Tested-by: Sourabh Jain <sourabhjain@linux.ibm.com>
#     Link: https://msgid.link/20240625134047.298759-1-npiggin@gmail.com
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 21a741eb75f80397e5f7d3739e24d7d75e619011
# make -s -j 24 ARCH=s390 O=/kisskb/build/powerpc-fixes_defconfig_s390x-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# Added to kconfig CONFIG_DEBUG_INFO_BTF=n
# Added to kconfig 
# < make -s -j 24 ARCH=s390 O=/kisskb/build/powerpc-fixes_defconfig_s390x-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 24 ARCH=s390 O=/kisskb/build/powerpc-fixes_defconfig_s390x-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-  olddefconfig
.config:3775:warning: override: reassigning to symbol DEBUG_INFO_BTF
# make -s -j 24 ARCH=s390 O=/kisskb/build/powerpc-fixes_defconfig_s390x-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_defconfig_s390x-gcc13
# Build took: 0:10:16.348760