Re: [PATCH] mm: fix wrong argument of migrate_huge_pages() insoft_offline_huge_page()

From: Andrew Morton
Date: Tue Jul 17 2012 - 16:49:11 EST

On Tue, 17 Jul 2012 13:42:23 -0700 (PDT)
David Rientjes <rientjes@xxxxxxxxxx> 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@xxxxxxxxx>
> Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
> 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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