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SubjectRe: [SPARSEMEM] confusing uses of SPARSEM_EXTREME (try #2)
Hi Dave,

2006/6/12, Dave Hansen <>:
> On Mon, 2006-06-12 at 09:00 +0200, Franck Bui-Huu wrote:
> > Is it me or the use of CONFIG_SPARSEMEM_EXTREME is really confusing in
> > mm/sparce.c ? Shouldn't we use CONFIG_SPARSEMEM_STATIC instead like
> > the following patch suggests ?
> I'll take positive config options over negative ones any day. I find it
> easier to read things that say what they *are* rather than what they are
> *not*.
> In any case, STATIC is really there as an override for architectures to
> say, "I know what I am doing, I use gcc 3.4 and above, or, I don't want
> to use bootmem". Extreme is really there to say, "I want two-level
> lookups because my memory is extremely sparse."
> Make sense?

yes and that's what the patch is trying to show...please take a look
to it and show me what part of the code, used by SPARSEMEM_STATIC
config, is dealing with the two-level lookups.

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