linux-kernel - Re: [PATCH 5/9] mm, hugetlb: remove redundant list_empty check in gather_surplus

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Date:	Mon, 22 Jul 2013 16:55:41 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	"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>
Subject: Re: [PATCH 5/9] mm, hugetlb: remove redundant list_empty check in
 gather_surplus_pages()

On Mon 15-07-13 18:52:43, Joonsoo Kim wrote:
> If list is empty, list_for_each_entry_safe() doesn't do anything.
> So, this check is redundant. Remove it.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Hocko <mhocko@...e.cz>

> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index a838e6b..d4a1695 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1019,10 +1019,8 @@ free:
>  	spin_unlock(&hugetlb_lock);
>  
>  	/* Free unnecessary surplus pages to the buddy allocator */
> -	if (!list_empty(&surplus_list)) {
> -		list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
> -			put_page(page);
> -		}
> +	list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
> +		put_page(page);
>  	}
>  	spin_lock(&hugetlb_lock);
>  
> -- 
> 1.7.9.5
> 

-- 
Michal Hocko
SUSE Labs
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