linux-kernel - Re: [patch] ext2: xip check fix

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Message-Id: <200712062217.40355.rob@landley.net>
Date:	Thu, 6 Dec 2007 22:17:39 -0600
From:	Rob Landley <rob@...dley.net>
To:	"Jared Hulbert" <jaredeh@...il.com>
Cc:	carsteno@...ibm.com, "Nick Piggin" <npiggin@...e.de>,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Jens Axboe" <axboe@...nel.dk>
Subject: Re: [patch] ext2: xip check fix

On Thursday 06 December 2007 21:22:25 Jared Hulbert wrote:
> > > I have'nt looked at it yet. I do appreciate it, I think it might
> > > broaden the user-base of this feature which is up to now s390 only due
> > > to the fact that the flash memory extensions have not been implemented
> > > (yet?). And it enables testing xip on other platforms. The patch is on
> > > my must-read list.
> >
> > query: which feature is currently s390 only?  (Execute In Place?)
>
> I think so.  The filemap_xip.c functionality doesn't work for Flash
> memory yet.  Flash memory doesn't have struct pages to back it up with
> which this stuff depends on.

Um, trying to clarify:  S390.  Also known as zSeries, big iron machine, uses 
its own weird processor design rather than x86, x86-64, arm, or mips 
processors.

How does "struct page" enter into this?

What I want to know is, are you saying execute in place doesn't work on things 
like arm and mips?  (I so, I was unaware of this.  I heard about somebody 
getting it to work on a Nintendo DS: 
http://forums.maxconsole.net/showthread.php?t=18668 )

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.
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