linux-kernel - Re: reiserfs NET=n build error

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Message-Id: <20061119130248.c7e7b181.randy.dunlap@oracle.com>
Date:	Sun, 19 Nov 2006 13:02:48 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Andi Kleen <ak@...e.de>, Jeff Mahoney <jeffm@...e.com>,
	lkml <linux-kernel@...r.kernel.org>, reiserfs-dev@...esys.com,
	sam@...nborg.org
Subject: Re: reiserfs NET=n build error

On Sun, 19 Nov 2006 20:57:11 +0000 Al Viro wrote:

> On Sun, Nov 19, 2006 at 11:04:33AM -0800, Randy Dunlap wrote:
> > Andi Kleen wrote:
> > >>>I would copy a relatively simple C implementation, like 
> > >>>arch/h8300/lib/checksum.c
> > >>As long as the h8300 version has the same output as the x86 version.
> > >
> > >The trouble is that the different architecture have different output 
> > >for csum_partial. So you already got a bug when someone wants to move
> > >file systems.
> > >
> > >-Andi
> > 
> > That argues for having only one version of it (in a lib.; my preference)
> > -or- Every module having its own local copy/version of it.  :(
> 
> Wrong.  csum_partial() result is defined modulo 0xffff and it's basically
> "whatever's convenient as intermediate for this architecture".
> 
> reiserfs use of it is just plain broken.  net/* is fine, since all
> final uses are via csum_fold() or equivalents.
> 
> Note that reiserfs use is broken in another way: it takes fixed-endian value
> and feeds it to cpu_to_le32().  IOW, even if everything had literally the
> same csum_partial(), the value it shits on disk would be endian-dependent.
> 
> As for net/*, with proper types it's pretty straightforward.  See
> davem's net-2.6.20 for that...

OK.  I guessed that there was some sanity in there somewhere (either
in the provider or consumer), but apparently there's none in either place.
:(

---
~Randy
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