linux-kernel - Re: [PATCH] mm: fix wrong argument of migrate_huge_pages() in soft_offline_huge

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Message-Id: <20120717134915.76adf9bd.akpm@linux-foundation.org>
Date:	Tue, 17 Jul 2012 13:49:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Joonsoo Kim <js1304@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Christoph Lameter <cl@...ux.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] mm: fix wrong argument of migrate_huge_pages() in
 soft_offline_huge_page()

On Tue, 17 Jul 2012 13:42:23 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> On Wed, 18 Jul 2012, Joonsoo Kim wrote:
> 
> > Commit a6bc32b899223a877f595ef9ddc1e89ead5072b8 ('mm: compaction: introduce
> > sync-light migration for use by compaction') change declaration of
> > migrate_pages() and migrate_huge_pages().
> > But, it miss changing argument of migrate_huge_pages()
> > in soft_offline_huge_page(). In this case, we should call with MIGRATE_SYNC.
> > So change it.
> > 
> > Additionally, there is mismatch between type of argument and function
> > declaration for migrate_pages(). So fix this simple case, too.
> > 
> > Signed-off-by: Joonsoo Kim <js1304@...il.com>
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> Should be cc'd to stable for 3.3+.

Well, why?  I'm suspecting a switch from MIGRATE_SYNC_LIGHT to
MIGRATE_SYNC will have no discernable effect.  Unless it triggers hitherto
unknkown about deadlocks...

For a -stable backport we should have a description of the end-user
visible effects of the bug.  This changelog lacked such a description.

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