linux-kernel - Re: [RESEND PATCH 2/4 v3] mm: fix possible incorrect return value of migrate

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Date:	Fri, 27 Jul 2012 15:57:33 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Sasha Levin <levinsasha928@...il.com>
Subject: Re: [RESEND PATCH 2/4 v3] mm: fix possible incorrect return value
 of migrate_pages() syscall

On Sat, 28 Jul 2012, Joonsoo Kim wrote:

> do_migrate_pages() can return the number of pages not migrated.
> Because migrate_pages() syscall return this value directly,
> migrate_pages() syscall may return the number of pages not migrated.
> In fail case in migrate_pages() syscall, we should return error value.
> So change err to -EBUSY

Lets leave this alone. This would change the migrate_pages semantics
because a successful move of N out of M pages would be marked as a
total failure although pages were in fact moved.

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