# 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 be8d3292869350190dac9cd58c75bc005e3fd5c2
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_currituck_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/currituck_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_currituck_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<U8dc0>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U8dc0>]' was declared here
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2591:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1852:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/powerpc/boot/dts/currituck.dts:125.28-161.5: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/currituck.dts:163.28-198.5: Warning (pci_bridge): /plb/pciex@30100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/currituck.dts:200.28-235.5: Warning (pci_bridge): /plb/pciex@38100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/dts/currituck.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Completed OK
# rm -rf /kisskb/build/powerpc-next_44x_currituck_defconfig_powerpc-gcc4.6
# Build took: 0:01:06.307586