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

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Date:	Tue, 16 Jul 2013 10:42:14 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	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
Subject: Re: [PATCH 5/9] mm, hugetlb: remove redundant list_empty check in
 gather_surplus_pages()

On Mon, Jul 15, 2013 at 08:01:24PM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
> 
> > 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>
> 
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> 
> 
> >
> > 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);
> >  	}
> 
> You can now remove '{' 

Okay.
I will do that.

Thanks.

> 
> 
> >  	spin_lock(&hugetlb_lock);
> >
> > -- 
> > 1.7.9.5
> 
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