# git rev-parse -q --verify 942523fd67563ea677cc03fc97635893d4350749^{commit}
942523fd67563ea677cc03fc97635893d4350749
already have revision, skipping fetch
# git checkout -q -f -B kisskb 942523fd67563ea677cc03fc97635893d4350749
# git clean -qxdf
# < git log -1
# commit 942523fd67563ea677cc03fc97635893d4350749
# Author: Oliver O'Halloran <oohall@gmail.com>
# Date:   Wed Nov 13 20:40:35 2019 +1100
# 
#     powerpc/powernv: Disable native PCIe port management
#     
#     On PowerNV the PCIe topology is (currently) managed by the powernv
#     platform code in cooperation with firmware. The PCIe-native service
#     drivers bypass both and this can cause problems.
#     
#     Historically this hasn't been a big deal since the only port service
#     driver that saw much use was the AER driver. The AER driver relies on
#     a kernel service to report when errors occur rather than acting
#     autonomously so it's fairly easy to ignore. On PowerNV (and pseries)
#     AER events are handled through EEH, which ignores the AER service, so
#     it's never been an issue.
#     
#     Unfortunately, the hotplug port service driver (pciehp) does act
#     autonomously and conflicts with the platform specific hotplug
#     driver (pnv_php). The main issue is that pciehp claims the interrupt
#     associated with the PCIe capability which in turn prevents pnv_php
#     from claiming it.
#     
#     This results in hotplug events being handled by pciehp which does not
#     notify firmware when the PCIe topology changes, and does not
#     setup/teardown the arch specific PCI device structures (pci_dn) when
#     the topology changes. The end result is that hot-added devices cannot
#     be enabled and hot-removed devices may not be fully torn-down on
#     removal.
#     
#     We can fix these problems 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.
#     
#     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/20191113094035.22394-1-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 942523fd67563ea677cc03fc97635893d4350749
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_powernv_defconfig+NO_NUMA_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  powernv_defconfig
# Added to kconfig CONFIG_NUMA=n
# yes \n | make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_powernv_defconfig+NO_NUMA_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_powernv_defconfig+NO_NUMA_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/include/linux/list.h:9:0,
                 from /kisskb/src/include/linux/wait.h:7,
                 from /kisskb/src/include/linux/wait_bit.h:8,
                 from /kisskb/src/include/linux/fs.h:6,
                 from /kisskb/src/fs/btrfs/send.c:7:
/kisskb/src/fs/btrfs/send.c: In function 'process_extent':
/kisskb/src/include/linux/kernel.h:37:33: warning: 'clone_src_i_size' may be used uninitialized in this function [-Wmaybe-uninitialized]
 #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                                 ^
/kisskb/src/fs/btrfs/send.c:5088:6: note: 'clone_src_i_size' was declared here
  u64 clone_src_i_size;
      ^
WARNING: vmlinux.o(.text+0x2fc8): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init 
annotation or the annotation of start_kernel is wrong.

Completed OK
# rm -rf /kisskb/build/powerpc-next_powernv_defconfig+NO_NUMA_ppc64le-gcc5
# Build took: 0:03:39.266441