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From: Ben Hutchings <bhutchings@solarflare.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: make NR_IRQS on 32bit is same to 64bit
Date: Tue, 04 Nov 2008 22:29:08 +0000	[thread overview]
Message-ID: <1225837748.3074.54.camel@achroite> (raw)
In-Reply-To: <4910C845.4060909@kernel.org>

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.


  reply	other threads:[~2008-11-04 22:29 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-04 22:10 Yinghai Lu
2008-11-04 22:29 ` Ben Hutchings [this message]
2008-11-04 22:34   ` Yinghai Lu
2008-11-06  6:26 ` Ingo Molnar
2008-11-06  6:42   ` Yinghai Lu
2008-11-06  6:52     ` H. Peter Anvin
2008-11-06  7:00       ` Yinghai Lu
2008-11-06  7:03         ` H. Peter Anvin
2008-11-06  7:10           ` Yinghai Lu
2008-11-06  7:28             ` Yinghai Lu
2008-11-06  7:36           ` Yinghai Lu
2008-11-06  8:35             ` Ingo Molnar
2008-11-06 21:59       ` Matt Mackall
2008-11-06 22:23         ` Ingo Molnar
2008-11-06 22:36           ` Matt Mackall

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