Messages in this thread | | | Subject | Re: Xen regression, Was: [PATCH] x86/irq: Probe for PIC presence before allocating descs for legacy IRQs | From | Boris Ostrovsky <> | Date | Tue, 12 Apr 2016 09:22:34 -0400 |
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On 04/11/2016 10:08 PM, Stefano Stabellini wrote: > Hi all, > > Unfortunately this patch (now commit > 8c058b0b9c34d8c8d7912880956543769323e2d8) causes a regression on Xen > when running on top of QEMU: the number of PIT irqs get set to 0 by > probe_8259A but actually there are 16. > > Any suggestions on how to fix this? > > 1) we could revert 8c058b0b9c34d8c8d7912880956543769323e2d8 > 2) we could introduce an 'if (!xen_domain())' in probe_8259A > 3) suggestions welcome
Stefano, do you have b4ff8389ed14b849354b59ce9b360bdefcdbf99c ?
It was supposed to fix this problem for Xen. However, I just noticed that arch/arm64/include/asm/irq.h makes nr_legacy_irqs() return 0 (unlike arch/arm/include/asm/irq.h). Could that be the problem?
-boris
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