linux-kernel - Re: [PATCH v2 7/7] mm/migrate: remove result argument on page allocation function for migration

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Date:	Wed, 11 Dec 2013 16:00:56 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Rafael Aquini <aquini@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH v2 7/7] mm/migrate: remove result argument on page
 allocation function for migration

On Wed, 11 Dec 2013, Joonsoo Kim wrote:

> In do_move_pages(), if error occurs, 'goto out_pm' is executed and the
> page status doesn't back to userspace. So we don't need to store err number.

If a page cannot be moved then the error code is containing the number of
pages that could not be migrated. The check there is for err < 0.
So a positive number is not an error.

migrate_pages only returns an error code if we are running out of memory.
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