# git rev-parse -q --verify 5bb60ea611db1e04814426ed4bd1c95d1487678e^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git fixes-test
# git rev-parse -q --verify 5bb60ea611db1e04814426ed4bd1c95d1487678e^{commit}
5bb60ea611db1e04814426ed4bd1c95d1487678e
# git checkout -q -f -B kisskb 5bb60ea611db1e04814426ed4bd1c95d1487678e
# git clean -qxdf
# < git log -1
# commit 5bb60ea611db1e04814426ed4bd1c95d1487678e
# Author: Christophe Leroy <christophe.leroy@csgroup.eu>
# Date:   Thu Nov 18 10:39:53 2021 +0100
# 
#     powerpc/32: Fix hardlockup on vmap stack overflow
#     
#     Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not
#     activate MMU before reading task struct") a vmap stack overflow
#     results in a hard lockup. This is because emergency_ctx is still
#     addressed with its virtual address allthough data MMU is not active
#     anymore at that time.
#     
#     Fix it by using a physical address instead.
#     
#     Fixes: c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct")
#     Cc: stable@vger.kernel.org # v5.10+
#     Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/ce30364fb7ccda489272af4a1612b6aa147e1d23.1637227521.git.christophe.leroy@csgroup.eu
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 5bb60ea611db1e04814426ed4bd1c95d1487678e
# < make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  defconfig
arch/m68k/configs/multi_defconfig:322:warning: symbol value 'm' invalid for MCTP
# < make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig
# make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc8
# Build took: 0:02:49.685413