linux-kernel - Re: Re : sparsemem usage

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Message-Id: <1154536422.23655.25.camel@localhost.localdomain>
Date:	Wed, 02 Aug 2006 17:33:42 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	moreau francis <francis_moreau2000@...oo.fr>
Cc:	linux-kernel@...r.kernel.org, apw@...dowen.org
Subject: Re: Re : sparsemem usage

Ar Mer, 2006-08-02 am 15:33 +0000, ysgrifennodd moreau francis:
> > sections but nothing stops you marking most of the 2Mb section except
> > the 128K that exists as "in use"
> 
> ok. But it will make pfn_valid() return "valid" for page beyond the first 128 KB.
> Won't that result in bad impacts later ?

Mapping out parts of a section is quite normal - think about the 640K to
1Mb hole in PC memory space.

Alan

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