linux-kernel - Re: [Xen-devel] [PATCH] xen/events: Always allocate legacy interrupts on PV guests

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Date:	Thu, 26 Nov 2015 18:22:27 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<konrad.wilk@...cle.com>, <david.vrabel@...rix.com>,
	<linux@....linux.org.uk>
CC:	<jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xen.org>, <stefano.stabellini@...rix.com>,
	<tglx@...utronix.de>, <vkuznets@...hat.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH] xen/events: Always allocate legacy interrupts
 on PV guests

On 20/11/15 16:25, Boris Ostrovsky wrote:
> After commit 8c058b0b9c34 ("x86/irq: Probe for PIC presence before
> allocating descs for legacy IRQs") early_irq_init() will no longer
> preallocate descriptors for legacy interrupts if PIC does not
> exist, which is the case for Xen PV guests.
> 
> Therefore we may need to allocate those descriptors ourselves.

Applied to for-linus-4.4, thanks.

> --- a/arch/arm64/include/asm/irq.h
> +++ b/arch/arm64/include/asm/irq.h
> @@ -7,4 +7,10 @@ struct pt_regs;
>  
>  extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
>  
> +#define NR_IRQS_LEGACY  0

I dropped this unnecessary #define.

David
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