linux-kernel - Re: [PATCH] x86: make NR_IRQS on 32bit is same to 64bit

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Message-Id: <1225837748.3074.54.camel@achroite>
Date:	Tue, 04 Nov 2008 22:29:08 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Yinghai Lu <yinghai@...nel.org>
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" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: make NR_IRQS on 32bit is same to 64bit

On Tue, 2008-11-04 at 14:10 -0800, Yinghai Lu wrote:
> 
> Impact: so NR_IRQS is bigger enough for system with lots of apic/pins
> 
> Now: if IO_APIC is there, will have big NR_IRQS
> 
> otherwise still use 224
[...]

I have no idea whether this is useful, but it doesn't solve the general
problem that probe_nr_irqs() can return a value > NR_IRQS.  So far as I
can see it can return up to 2 * 24 * MAX_IO_APICS which may be greater
than NR_VECTORS + (32 * max(MAX_IO_APICS, NR_CPUS)).

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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