On Mon, 11 Dec 2017, Anand, Jerome wrote: > > On Fri, 8 Dec 2017, Ville Syrjälä wrote: > > > > > On Fri, Dec 08, 2017 at 05:33:23PM +0800, Augustine.Chen wrote: > > > > The chip data of HDMI LPE audio is set to drm_i915_private which is > > > > not consistent with the expectation by x86 APIC driver. > > > > > > Hmm. Why is the apic code looking at data for an irq chip it hasn't > > > created? > > > > > apic code expects an irq domain to be place as generic approach. APIC code does not even see that interrupt at all. It's completely disconnected. > > > > In the case of not enabling CONFIG_CPUMASK_OFFSTACK, this would > > > > cause kernel panic while doing CPU hotplug. > > > > And why so? Surely not because you set irq_chip_data. That's really no > > explanation at all. > > > > Ideally, I feel there needs to be an irq domain for mapping the irq > numbers with hwirq. It is not created as part of the hdmi lpe audio > bridge. Since the logic to mask/unmask lpe audio interrupts is removed, > there is no need of the Chip data or creation of the domain now. That still does not explain why this is broken with CONFIG_CPUMASK_OFFSTACK=n and cpu hotplug. Thanks, tglx
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