linux-kernel - Re: [BLOCK2MTD] WARNING: at kernel/lockdep.c:2331 lockdep_init

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Message-ID: <20071020092950.GB32465@lazybastard.org>
Date:	Sat, 20 Oct 2007 11:29:50 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Erez Zadok <ezk@...sunysb.edu>
Cc:	Jörn Engel <joern@...fs.org>, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [BLOCK2MTD] WARNING: at kernel/lockdep.c:2331 lockdep_init_map()

On Fri, 19 October 2007 16:04:10 -0400, Erez Zadok wrote:
> In message <20071019191433.GK26913@...ybastard.org>, =?utf-8?B?SsO2cm4=?= Engel writes:
> > 
> > Since when roughly?  2.6.20ish?  Before?
> 
> Yeah, I guess around that time.  If you want, I could go back and test each
> of my backports and see if it has the lockdep message or not.

That's ok.  Just wanted to get a rough idea.

> > Side note: you don't need mtdblock:
> > # cp jffs2-empty.img /tmp/foo
> > # losetup /dev/loop0 /tmp/foo
> > # modprobe block2mtd block2mtd=/dev/loop0,128ki
> > # mount -t jffs2 mtd0 /n/lower/b0
> > 
> > It doesn't really hurt, 'tis just superfluous.
> 
> Neat.  Curious, but where does "mtd0" come from then?  It's not in my /dev
> (which uses devfs on an FC6 system).

JFFS2 interprets that itself.  The only reason why JFFS2 needed a block
device was to determine the minor number of the mtd underneith.  So code
was added to find the correct mtd from "mtd0" or "mtd:some_name"
instead.  I believe you can even disable CONFIG_BLOCK now.

And the code itself was moved to drivers/mtd/mtdsuper.c fairly recently.

Jörn

-- 
Joern's library part 2:
http://www.art.net/~hopkins/Don/unix-haters/tirix/embarrassing-memo.html
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