linux-kernel - Re: possible regression on 3.13 when calling flush_dcache

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Date:	Mon, 16 Dec 2013 15:43:43 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: possible regression on 3.13 when calling flush_dcache_page

Hello,

On Fri, Dec 13, 2013 at 10:59:09AM +0900, Joonsoo Kim wrote:
> On Thu, Dec 12, 2013 at 03:36:19PM +0100, Ludovic Desroches wrote:
> > fix mmc mailing list address error
> > 
> > On Thu, Dec 12, 2013 at 03:31:50PM +0100, Ludovic Desroches wrote:
> > > Hi,
> > > 
> > > With v3.13-rc3 I have an error when the atmel-mci driver calls
> > > flush_dcache_page (log at the end of the message).
> > > 
> > > Since I didn't have it before, I did a git bisect and the commit introducing
> > > the error is the following one:
> > > 
> > > 106a74e slab: replace free and inuse in struct slab with newly introduced active
> > > 
> > > I don't know if this commit has introduced a bug or if it has revealed a bug
> > > in the atmel-mci driver.
> 
> Hello,
> 
> I think that this commit may not introduce a bug. This patch remove one
> variable on slab management structure and replace variable name. So there
> is no functional change.
> 

If I have reverted this patch and other ones you did on top of it and
the issue disappear.

> I doubt that side-effect of this patch reveals a bug in other place.
> Side-effect is reduced memory usage for slab management structure. It would
> makes some slabs have more objects with more density since slab management
> structure is sometimes on the page for objects. So if it diminishes, more
> objects can be in the page.
> 
> Anyway, I will look at it more. If you have any progress, please let me know.

No progress at the moment.


Regards

Ludovic

> 
> Thanks.
> 
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