Hi Linus, please consider pulling a patch series for 4.8 from:
https://github.com/jgross1/linux.git tags/for-linus-4-8 Support calling functions on dedicated physical cpu Some hardware (e.g. Dell Studio laptops) require special functions to be called on physical cpu 0 in order to avoid occasional hangs. When running as dom0 under Xen this could be achieved only via special boot parameters (vcpu pinning) limiting the hypervisor in it's scheduling decisions. This patch series is adding a generic function to be able to temporarily pin a (virtual) cpu to a dedicated physical cpu for executing above mentioned functions on that specific cpu. The drivers (dcdbas and i8k) requiring this functionality are modified accordingly. Unfortunately 2 of the 6 patches got no Acks as the maintainers didn't react in spite of multiple pings and resends. The core modification in the scheduler got an Ack from Peter and multiple tests showed no regressions. As the series is touching multiple subsystems I couldn't find anyone willing to take the series via his tree (I tried Ingo, Thomas, Peter). Juergen Gross (6): xen: sync xen header virt, sched: add generic vcpu pinning support smp: add function to execute a function synchronously on a cpu xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu dcdbas: make use of smp_call_on_cpu() hwmon: use smp_call_on_cpu() for dell-smm i8k MAINTAINERS | 1 + arch/x86/include/asm/hypervisor.h | 4 ++ arch/x86/kernel/cpu/hypervisor.c | 11 +++++ arch/x86/xen/enlighten.c | 40 +++++++++++++++ drivers/firmware/dcdbas.c | 51 +++++++++---------- drivers/hwmon/dell-smm-hwmon.c | 36 ++++++++------ include/linux/hypervisor.h | 17 +++++++ include/linux/smp.h | 3 ++ include/xen/interface/sched.h | 100 +++++++++++++++++++++++++++++++------- kernel/smp.c | 51 +++++++++++++++++++ kernel/up.c | 18 +++++++ 11 files changed, 273 insertions(+), 59 deletions(-) create mode 100644 include/linux/hypervisor.h
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