linux-kernel - Re: [PATCH 5/5] x86: update nr

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Date:	Fri, 8 Jan 2010 11:49:36 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] x86: update nr_irqs according cpu num

On Fri, Jan 8, 2010 at 11:11 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
>
>> that is max number on run time.
>
> Ouch!  Unless I misread this code this will leave nr_irqs at
> NR_IRQS_LEGACY. aka 16.

nr_irqs is set to NR_IRQS before.

>
> Let's do something stupid and simple.
> nr_irqs = nr_cpus_ids * 256;  /* Semi-arbitrary number */
>
> Ideally we would set "nr_irqs = 0x7fffffff;" but we have just enough
> places using nr_irqs that I think those loops would get painful if we
> were to do that.

or you need have NR_IRQS = NR_CPUS * 256 at first,

and then make nr_irqs = nr_cpu_ids * 224 ?

YH
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