linux-kernel - Re: [PATCH v2 04/20] mm, hugetlb: remove useless check about mapping type

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Date:	Mon, 12 Aug 2013 06:31:17 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH v2 04/20] mm, hugetlb: remove useless check about
 mapping type

On Fri, 2013-08-09 at 18:26 +0900, Joonsoo Kim wrote:
> is_vma_resv_set(vma, HPAGE_RESV_OWNER) implys that this mapping is
> for private. So we don't need to check whether this mapping is for
> shared or not.
> 
> This patch is just for clean-up.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Reviewed-by: Davidlohr Bueso <davidlohr@...com>

> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index ea1ae0a..c017c52 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -2544,8 +2544,7 @@ retry_avoidcopy:
>  	 * at the time of fork() could consume its reserves on COW instead
>  	 * of the full address range.
>  	 */
> -	if (!(vma->vm_flags & VM_MAYSHARE) &&
> -			is_vma_resv_set(vma, HPAGE_RESV_OWNER) &&
> +	if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) &&
>  			old_page != pagecache_page)
>  		outside_reserve = 1;
>  


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