# git rev-parse -q --verify ac61c1156623455c46701654abd8c99720bceea1^{commit}
ac61c1156623455c46701654abd8c99720bceea1
already have revision, skipping fetch
# git checkout -q -f -B kisskb ac61c1156623455c46701654abd8c99720bceea1
# git clean -qxdf
# < git log -1
# commit ac61c1156623455c46701654abd8c99720bceea1
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Wed Apr 25 12:17:53 2018 +1000
# 
#     powerpc: Fix smp_send_stop NMI IPI handling
#     
#     The NMI IPI handler for a receiving CPU increments nmi_ipi_busy_count
#     over the handler function call, which causes later smp_send_nmi_ipi()
#     callers to spin until the call is finished.
#     
#     The stop_this_cpu() function never returns, so the busy count is never
#     decremeted, which can cause the system to hang in some cases. For
#     example panic() will call smp_send_stop() early on which calls
#     stop_this_cpu() on other CPUs, then later in the reboot path,
#     pnv_restart() will call smp_send_stop() again, which hangs.
#     
#     Fix this by adding a special case to the stop_this_cpu() handler to
#     decrement the busy count, because it will never return.
#     
#     Now that the NMI/non-NMI versions of stop_this_cpu() are different,
#     split them out into separate functions rather than doing #ifdef tricks
#     to share the body between the two functions.
#     
#     Fixes: 6bed3237624e3 ("powerpc: use NMI IPI for smp_send_stop")
#     Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     [mpe: Split out the functions, tweak change log a bit]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < git log --format=%s --max-count=1 ac61c1156623455c46701654abd8c99720bceea1
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/boot/dts/qcom/apq8096-db820c.dtb: Warning (pci_bridge): /soc/agnoc@0/qcom,pcie@610000: node name is not "pci" or "pcie"
arch/arm64/boot/dts/qcom/apq8096-db820c.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dtb: Warning (pci_bridge): /pcie@10003000/pci@1,0: missing bus-range for PCI bridge
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dtb: Warning (pci_bridge): /pcie@10003000/pci@2,0: missing bus-range for PCI bridge
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dtb: Warning (pci_bridge): /pcie@10003000/pci@3,0: missing bus-range for PCI bridge
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
arch/arm64/boot/dts/qcom/msm8996-mtp.dtb: Warning (pci_bridge): /soc/agnoc@0/qcom,pcie@610000: node name is not "pci" or "pcie"
arch/arm64/boot/dts/qcom/msm8996-mtp.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_arm64-defconfig_arm64
# Build took: 0:04:46.200793