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

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Message-Id: <1179510619.29302.14.camel@dyn9047017100.beaverton.ibm.com>
Date:	Fri, 18 May 2007 10:50:19 -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 Fri, 2007-05-18 at 19:03 +0200, Jens Axboe wrote:
> On Fri, May 18 2007, Badari Pulavarty wrote:
> > On Fri, 2007-05-18 at 09:33 +0200, Jens Axboe wrote:
> > > On Thu, May 17 2007, Badari Pulavarty wrote:
> > > > 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.
> > > 
> > > Hmm, looks ok, I'm guessing it's just missing a memset (or just turn it
> > > into a kzalloc())?
> > > 
> > 
> > Even with backing out all the ide changes, I get this on boot
> > once in a while.
> 
> Yep, I think the ide changes are fine as such, the problem is the
> missing memset/kzalloc. Can you try that?

kzalloc() made it better. I haven't seen ide panics anymore. I will try
it again after applying ide patches.

Thanks
Badari


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