# git rev-parse -q --verify 454099efd693c76a25d6326d2c5b1d7003b480f9^{commit}
454099efd693c76a25d6326d2c5b1d7003b480f9
already have revision, skipping fetch
# git checkout -q -f -B kisskb 454099efd693c76a25d6326d2c5b1d7003b480f9
# git clean -qxdf
# < git log -1
# commit 454099efd693c76a25d6326d2c5b1d7003b480f9
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Fri Feb 14 06:53:00 2020 +0000
# 
#     powerpc/6xx: Fix power_save_ppc32_restore() with CONFIG_VMAP_STACK
#     
#     power_save_ppc32_restore() is called during exception entry, before
#     re-enabling the MMU. It substracts KERNELBASE from the address
#     of nap_save_msscr0 to access it.
#     
#     With CONFIG_VMAP_STACK enabled, data MMU translation has already been
#     re-enabled, so power_save_ppc32_restore() has to access
#     nap_save_msscr0 by its virtual address.
#     
#     Reported-by: Larry Finger <Larry.Finger@lwfinger.net>
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
#     Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/7bce32ccbab3ba3e3e0f27da6961bf6313df97ed.1581663140.git.christophe.leroy@c-s.fr
# < /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 454099efd693c76a25d6326d2c5b1d7003b480f9
# < make -s -j 10 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# make -s -j 10 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8
# Build took: 0:09:00.467142