# git rev-parse -q --verify c6ac667b07996929835b512de0e9a988977e6abc^{commit}
c6ac667b07996929835b512de0e9a988977e6abc
already have revision, skipping fetch
# git checkout -q -f -B kisskb c6ac667b07996929835b512de0e9a988977e6abc
# git clean -qxdf
# < git log -1
# commit c6ac667b07996929835b512de0e9a988977e6abc
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Fri May 14 14:40:08 2021 +1000
# 
#     powerpc/64e/interrupt: Fix nvgprs being clobbered
#     
#     Some interrupt handlers have an "extra" that saves 1 or 2
#     registers (r14, r15) in the paca save area and makes them available to
#     use by the handler.
#     
#     The change to always save nvgprs in exception handlers lead to some
#     interrupt handlers saving those scratch r14 / r15 registers into the
#     interrupt frame's GPR saves, which get restored on interrupt exit.
#     
#     Fix this by always reloading those scratch registers from paca before
#     the EXCEPTION_COMMON that saves nvgprs.
#     
#     Fixes: 4228b2c3d20e ("powerpc/64e/interrupt: always save nvgprs on interrupt")
#     Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20210514044008.1955783-1-npiggin@gmail.com
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 c6ac667b07996929835b512de0e9a988977e6abc
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# Added to kconfig CONFIG_MEMORY_HOTPLUG=y
# Added to kconfig CONFIG_MEMORY_HOTREMOVE=n
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc-gcc9
# Build took: 0:02:18.226418