linux-kernel - Re: [PATCH 00/42] dyn_array/nr_irqs/sparse

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Date:	Fri, 08 Aug 2008 15:25:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/42] dyn_array/nr_irqs/sparse_irq support v5

Yinghai Lu wrote:
>>>
>> So I'm still clearly missing something about this... if we need sparse IRQs
>> in the first place (which we do), what's the point of the dyn_array?
> 
> x86_64: support CONFIG_HAVE_SPARSE_IRQ and CONFIG_DYN_ARRAY
> x86_32: support CONFIG_DYN_ARRAY
> 
> some arches could use dyn_array with probing nr_irqs and it could be
> 32 and much less than 224.
> some could have that like 512. and those arch may not need to mess up
> with sparse_irq at first point.
> but still could get some flexibilty about that array size.
> 

As an x86 maintainer, I definitely do not want x86-64 and x86-32 to 
diverge unless there is an extremely strong reason to.

Other architectures may speak for themselves, but why not just support 
sparse IRQs on x86-32 *and* -64 and skip the dyn_array variant?

	-=hpa

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