linux-kernel - Re: [PATCH] mm: fix status code move

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Message-ID: <alpine.DEB.2.11.1506290947560.3164@east.gentwo.org>
Date:	Mon, 29 Jun 2015 09:50:48 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] mm: fix status code move_pages() returns for zero page

On Wed, 24 Jun 2015, Kirill A. Shutemov wrote:

> Man page for move_pages(2) specifies that status code for zero page is
> supposed to be -EFAULT. Currently kernel return -ENOENT in this case.
>
> follow_page() can do it for us, if we would ask for FOLL_DUMP.

FOLL_DUMP also has the consequence that the upper layer page tables pages
are no longer allocated.

Otherwise this looks ok.

Reviewed-by: Christoph Lameter <cl@...ux.com>
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