linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Message-ID: <6934efce0706151030v3357afe6q8073c59610f3b924@mail.gmail.com>
Date:	Fri, 15 Jun 2007 10:30:19 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	"Heiko Carstens" <heiko.carstens@...ibm.com>
Cc:	carsteno@...ibm.com, "Nick Piggin" <nickpiggin@...oo.com.au>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	richard.griffiths@...driver.com,
	"Richard Griffiths" <res07ml0@...izon.net>,
	linux-kernel@...r.kernel.org,
	"Jörn Engel" <joern@...ybastard.org>,
	"Heiko Carstens" <h.carstens@...ibm.com>
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

> If you can write code that doesn't need any struct pages that would make
> life a bit easier, since we wouldn't need any pseudo memory hotplug code
> that just adds struct pages.

That was my gut feel too.  However, it seems from Carsten and Jörn
discussion of read/write XIP on Flash (and some new Phase Change)
memories that having the struct pages has a lot of potential benefits.
 Wouldn't it also allow most of the mm routines to remain unchanged.
I just worry that it would be difficult to set apart these non
volitatile pages that can't be written too directly.

> We would still need to add the kernel mapping though.

But that's handled by ioremap()ing it right?
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