linux-kernel - Re: [PATCH] x86: fix probe_nr

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Date:	Thu, 21 Aug 2008 17:02:55 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alex Nixon <alex.nixon@...rix.com>
Subject: Re: [PATCH] x86: fix probe_nr_irqs for xen

Yinghai Lu wrote:
> like system vectors with smp-ipi etc?
>   

More or less.  Xen currently uses 6 per-cpu event channels, and it maps
each to its own irq.  My plan is to allocate just 6 irqs, map 6 vectors
to them, and bind each event channel to a vector/cpu pair.  If nothing
else, it will make /proc/interrupts somewhat sane again.


>> Also, implementing probe_nr_irqs() in a more generic (rather than
>> io_apic-specific) way.  Using some interface that queries each irq chip
>> for how many irqs it supports, or something.
>>     
>
> hope we can kill nr_irqs/NR_IRQS
>   

When irqs are truely dynamically allocated?

    J
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