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

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Message-ID: <alpine.DEB.2.00.1206110935070.31180@router.home>
Date:	Mon, 11 Jun 2012 09:43:38 -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>, stable@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split
 handle vma->vm_policy linkages"

On Mon, 11 Jun 2012, kosaki.motohiro@...il.com wrote:

> From: KOSAKI Motohiro <kosaki.motohiro@...il.com>
>
> commit 05f144a0d5 "mm: mempolicy: Let vma_merge and vma_split handle
> vma->vm_policy linkages" removed a vma->vm_policy updates. But it is
> a primary purpose of mbind_range(). Now, mbind(2) is no-op in several
> case unintentionally. It is not ideal fix. This patch reverts it.

Rewritten changelog:

commit 05f144a0d5 "mm: mempolicy: Let vma_merge and vma_split handle
vma->vm_policy linkages" removed policy_vma() but the function is
needed in this patchset.


(It is not clear to me what the last sentences mean. AFAICT the code for
policy_vma() still exists in another function prior to this patch)


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