# git rev-parse -q --verify d6e3af06d947d4f23b5698007e9a1a6313d2ed58^{commit}
d6e3af06d947d4f23b5698007e9a1a6313d2ed58
already have revision, skipping fetch
# git checkout -q -f -B kisskb d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# git clean -qxdf
# < git log -1
# commit d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# Author: Greg Kurz <groug@kaod.org>
# Date:   Wed May 15 12:05:01 2019 +0200
# 
#     powerpc/pseries: Fix xive=off command line
#     
#     On POWER9, if the hypervisor supports XIVE exploitation mode, the
#     guest OS will unconditionally requests for the XIVE interrupt mode
#     even if XIVE was deactivated with the kernel command line xive=off.
#     Later on, when the spapr XIVE init code handles xive=off, it disables
#     XIVE and tries to fall back on the legacy mode XICS.
#     
#     This discrepency causes a kernel panic because the hypervisor is
#     configured to provide the XIVE interrupt mode to the guest :
#     
#       kernel BUG at arch/powerpc/sysdev/xics/xics-common.c:135!
#       ...
#       NIP xics_smp_probe+0x38/0x98
#       LR  xics_smp_probe+0x2c/0x98
#       Call Trace:
#         xics_smp_probe+0x2c/0x98 (unreliable)
#         pSeries_smp_probe+0x40/0xa0
#         smp_prepare_cpus+0x62c/0x6ec
#         kernel_init_freeable+0x148/0x448
#         kernel_init+0x2c/0x148
#         ret_from_kernel_thread+0x5c/0x68
#     
#     Look for xive=off during prom_init and don't ask for XIVE in this
#     case. One exception though: if the host only supports XIVE, we still
#     want to boot so we ignore xive=off.
#     
#     Similarly, have the spapr XIVE init code to looking at the interrupt
#     mode negotiated during CAS, and ignore xive=off if the hypervisor only
#     supports XIVE.
#     
#     Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller")
#     Cc: stable@vger.kernel.org # v4.20
#     Reported-by: Pavithra R. Prakash <pavrampu@in.ibm.com>
#     Signed-off-by: Greg Kurz <groug@kaod.org>
#     Reviewed-by: Cédric Le Goater <clg@kaod.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  44x/akebono_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:251.28-289.5: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:291.28-329.5: Warning (pci_bridge): /plb/pciex@20100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:331.28-369.5: Warning (pci_bridge): /plb/pciex@18100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:371.28-409.5: Warning (pci_bridge): /plb/pciex@28100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/dts/akebono.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc-gcc5
# Build took: 0:00:51.596165