linux-kernel - Re: [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split handle vma->vm

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Date:	Wed, 30 May 2012 14:44:14 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...gle.com>, Dave Jones <davej@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...r.kernel.org, hughd@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split
 handle vma->vm_policy linkages"

On Wed, 30 May 2012, KOSAKI Motohiro wrote:

> > You are dropping the nice comments by Mel that explain the refcounting.
>
> Because this is not strictly correct. 1) vma_merge() and split_vma() don't
> care mempolicy refcount. They only dup and drop it. 2) This mpol_get() is
> for vma attaching. This function don't need to care sp_node internal.

Ok then say so in the changelog.


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