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SubjectRe: [PATCH 0/2] Add boot interrupt quirk mechanism for Xeon chipsets
Thomas Gleixner <> writes:

> Sean V Kelley <> writes:
>> When IRQ lines on secondary or higher IO-APICs are masked (e.g.,
>> Real-Time threaded interrupts), many chipsets redirect IRQs on
>> this line to the legacy PCH and in turn the base IO-APIC in the
>> system. The unhandled interrupts on the base IO-APIC will be
>> identified by the Linux kernel as Spurious Interrupts and can
>> lead to disabled IRQ lines.
>> Disabling this legacy PCI interrupt routing is chipset-specific and
>> varies in mechanism between chipset vendors and across generations.
>> In some cases the mechanism is exposed to BIOS but not all BIOS
>> vendors choose to pick it up. With the increasing usage of RT as it
>> marches towards mainline, additional issues have been raised with
>> more recent Xeon chipsets.
>> This patchset disables the boot interrupt on these Xeon chipsets where
>> this is possible with an additional mechanism. In addition, this
>> patchset includes documentation covering the background of this quirk.
> Well done! The documentation is really appreciated!
> Reviewed-by: Thomas Gleixner <>

Bjorn, this should go into stable as well IMO.



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