linux-kernel - Re: [PATCH 2/3] mm: fix possible incorrect return value of migrate

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Date:	Mon, 16 Jul 2012 12:26:41 -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: [PATCH 2/3] mm: fix possible incorrect return value of
 migrate_pages() syscall

On Tue, 17 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 -EIO

Pages are not migrated because they are busy not because there is an
error. So lets return EBUSY.
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