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

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Message-ID: <6934efce0706071419n2557603cl85e820d0612787a@mail.gmail.com>
Date:	Thu, 7 Jun 2007 14:19:28 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	carsteno@...ibm.com
Cc:	"Christoph Hellwig" <hch@...radead.org>,
	"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
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

> I've had a few beer long discussion with Joern Engel and David
> Woodhouse on this one. To cut a long discussion short: the current XIP
> infrastructure is not sufficient to be used on top of mtd. We'd need
> some extenstions:
> - on get_xip_page() we'd need to state if we want the reference
> read-only or read+write
> - we need a put_xip_page() to return references
> - and finally we need a callback for the referece, so that the mtd
> driver can ask to get its reference back (in order to unmap from
> userland when erasing a block)

Yes. And one more thing.  We can't assume every page in a file is XIP or not.

However, I still can't get even the existing get_xip_page() to work
for me so we are getting ahead of ourselves;)  Looking back on this
thread I realize I haven't confirmed if my cramfs_get_xip_page() gets
a page struct.  I assume that is my problem?  The UML find_iomem()
probably returns psuedo iomem with page structs.  While ioremap() does
not return with page struct backed memory.
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