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

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Message-ID: <4910CDF6.1040901@kernel.org>
Date:	Tue, 04 Nov 2008 14:34:30 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ben Hutchings <bhutchings@...arflare.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" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: make NR_IRQS on 32bit is same to 64bit

Ben Hutchings wrote:
> 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)).

your patch is still needed...
also please add one WARN_ON when nr > NR_IRQS.

YH
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