linux-kernel - Re: [PATCH] Chaining sg lists for big IO commands v5

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Message-Id: <1179414662.23725.3.camel@dyn9047017100.beaverton.ibm.com>
Date:	Thu, 17 May 2007 08:11:02 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, bhalevy@...asas.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	fujita.tomonori@....ntt.co.jp, michaelc@...wisc.edu
Subject: Re: [PATCH] Chaining sg lists for big IO commands v5

On Thu, 2007-05-17 at 08:27 +0200, Jens Axboe wrote:
.. 
> > > 
> > > Ah ok, you need the updated patch series for ppc64 support. Builds fine
> > > here on ppc64. See the #sglist branch of the block repo:
> > > 
> > > git://git.kernel.dk/data/git/linux-2.6-block.git
> > > 
> > > I can mail you an updated patch, if you want.
> > 
> > 
> > Here is the whole panic stack..
> 
> Thanks will fix that up, the IDE part is totally untested. Can you try
> and backout this patch and see if it boots?

Yes. It boots fine with following backed out.

Looking at the code ide_probe.c: hwif_init() is doing

        hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
                                 GFP_KERNEL);

blk_rq_map_sg() is looking for the chaining info and going over end of the
allocation.


Thanks,
Badari



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