linux-kernel - Re: [PATCH] mm: __count_immobile_pages make sure the node is online

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Date:	Thu, 12 Jan 2012 22:39:13 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH] mm: __count_immobile_pages make sure the node is online

On Thu 12-01-12 13:26:29, Andrew Morton wrote:
> On Thu, 12 Jan 2012 13:35:55 +0100
> Michal Hocko <mhocko@...e.cz> wrote:
> 
> > On Thu 12-01-12 11:14:15, Mel Gorman wrote:
> > > On Thu, Jan 12, 2012 at 11:05:21AM +0100, Michal Hocko wrote:
> > 
> > > Be aware that this is not the version picked up by Andrew. It would
> > > not hurt to resend as V2 with a changelog and a note saying it replaces
> > > mm-fix-null-ptr-dereference-in-__count_immobile_pages.patch in mmotm.
> 
> They're rather different things? According to the changelogs,
> mm-fix-null-ptr-dereference-in-__count_immobile_pages.patch fixes a
> known-to-occur oops. 
> mm-__count_immobile_pages-make-sure-the-node-is-online.patch fixes a
> bug which might happen in the future if we change the node_zones layut?

Yes, and that's the reason why I posted it as a separate patch. I could
also have squashed both patches together and it would work the same way
but I think that the zone issue wouldn't be that obvious.

> 
> So I'm thinking that
> mm-fix-null-ptr-dereference-in-__count_immobile_pages.patch is 3.3 and
> -stable material, whereas this patch
> (mm-__count_immobile_pages-make-sure-the-node-is-online.patch) is 3.3
> material.  (Actually, it's 3.4 material which I shall stuff into 3.3
> because the amount of MM material which we're putting into 3.3 is just
> off the charts and I fear that 3.4 will be similar)

Agreed

Thanks
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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