# git rev-parse -q --verify be8d3292869350190dac9cd58c75bc005e3fd5c2^{commit}
be8d3292869350190dac9cd58c75bc005e3fd5c2
already have revision, skipping fetch
# git checkout -q -f -B kisskb be8d3292869350190dac9cd58c75bc005e3fd5c2
# git clean -qxdf
# < git log -1
# commit be8d3292869350190dac9cd58c75bc005e3fd5c2
# Author: Oliver O'Halloran <oohall@gmail.com>
# Date:   Mon Nov 18 17:55:53 2019 +1100
# 
#     powerpc/powernv: Disable native PCIe port management
#     
#     On PowerNV the PCIe topology is (currently) managed by the powernv platform
#     code in Linux in cooperation with the platform firmware. Linux's native
#     PCIe port service drivers operate independently of both and this can cause
#     problems.
#     
#     The main issue is that the portbus driver will conflict with the platform
#     specific hotplug driver (pnv_php) over ownership of the MSI used to notify
#     the host when a hotplug event occurs. The portbus driver claims this MSI on
#     behalf of the individual port services because the same interrupt is used
#     for hotplug events, PMEs (on root ports), and link bandwidth change
#     notifications. The portbus driver will always claim the interrupt even if
#     the individual port service drivers, such as pciehp, are compiled out.
#     
#     The second, bigger, problem is that the hotplug port service driver
#     fundamentally does not work on PowerNV. The platform assumes that all
#     PCI devices have a corresponding arch-specific handle derived from the DT
#     node for the device (pci_dn) and without one the platform will not allow
#     a PCI device to be enabled. This problem is largely due to historical
#     baggage, but it can't be resolved without significant re-factoring of the
#     platform PCI support.
#     
#     We can fix these problems in the interim by setting the
#     "pcie_ports_disabled" flag during platform initialisation. The flag
#     indicates the platform owns the PCIe ports which stops the portbus driver
#     from being registered.
#     
#     This does have the side effect of disabling all port services drivers
#     that is: AER, PME, BW notifications, hotplug, and DPC. However, this is
#     not a huge disadvantage on PowerNV since these services are either unused
#     or handled through other means.
#     
#     Fixes: 66725152fb9f ("PCI/hotplug: PowerPC PowerNV PCI hotplug driver")
#     Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191118065553.30362-1-oohall@gmail.com
# < /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 be8d3292869350190dac9cd58c75bc005e3fd5c2
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc8272_ads_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  mpc8272_ads_defconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc8272_ads_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/head_32.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_32.S:945: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x57f82c) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
INFO: Uncompressed kernel (size 0x56f1e8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Image Name:   Linux-5.4.0-rc2-gbe8d32928693
Created:      Mon Nov 18 23:49:47 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2824130 Bytes = 2757.94 KiB = 2.69 MiB
Load Address: 00000000
Entry Point:  00000000
Image Name:   Linux-5.4.0-rc2-gbe8d32928693
Created:      Mon Nov 18 23:49:47 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2854231 Bytes = 2787.33 KiB = 2.72 MiB
Load Address: 00600000
Entry Point:  00600894
Completed OK
# rm -rf /kisskb/build/powerpc-next_mpc8272_ads_defconfig_powerpc-gcc5
# Build took: 0:01:07.547193