Messages in this thread | | | Date | Thu, 3 Dec 2015 15:06:03 +0000 | From | David Vrabel <> | Subject | Re: [Xen-devel] [PATCHv1] x86: rtc_cmos platform device requires legacy irqs |
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On 03/12/15 11:23, Vitaly Kuznetsov wrote: > David Vrabel <david.vrabel@citrix.com> writes: > >> Adding the rtc platform device when there are no legacy irqs (no >> legacy PIC) > > No PIC != No legacy IRQs, Hyper-V Gen2 represents such a platform (and > it has RTC on irq8). I've tested this patch against it and it appears to > work because the device is present in ACPI and we initialize it in > drivers/acpi/acpi_cmos_rtc.c, add_rtc_cmos() bails out in the very > beginning as we see PNP0b00 device.
It's not a legacy IRQ if it isn't going via the legacy PIC, it just happens to have the same number.
I think it is safe to assume that any machine with a CMOS RTC but no PNP information is also going to have a legacy PIC.
David
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