linux-kernel - Re: [QUICKLIST 1/4] Generic quicklist implementation

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Message-ID: <Pine.LNX.4.64.0703151348370.27391@schroedinger.engr.sgi.com>
Date:	Thu, 15 Mar 2007 13:51:59 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Paul Mundt <lethal@...ux-sh.org>
cc:	akpm@...ux-foundation.org, linux-mm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 1/4] Generic quicklist implementation

On Tue, 13 Mar 2007, Paul Mundt wrote:

> This doesn't work, and so CONFIG_QUICKLIST is always set. The NR_QUICK
> thing seems a bit backwards anyways, perhaps it would make more sense to
> have architectures set CONFIG_GENERIC_QUICKLIST in the same way that the
> other GENERIC_xxx bits are defined, and then set NR_QUICK based off of
> that. It's obviously going to be 2 or 1 for most people, and x86 seems to
> be the only one that needs 2.

Both i386 and x86_64 currently need 2 and if other arches start using 
quicklists then they would have the same issues. There may be other 
cases in the future where these may be useful. So I think this is too 
inflexible.

> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 7942b33..2f20860 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -163,3 +163,8 @@ config ZONE_DMA_FLAG
>  	default "0" if !ZONE_DMA
>  	default "1"
>  
> +config NR_QUICK
> +	int
> +	depends on GENERIC_QUICKLIST
> +	default "2" if X86
> +	default "1"
> 

Is there a way of checking if a CONFIG_xxx is set to any value?

Then we could do

config QUICKLISTS
	depends on defined(NR_QUICK)

Alternately we could replace #ifdef CONFIG_QUICKLISTS with
#ifdef CONFIG_NR_QUICK ?

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