linux-kernel - Re: [PATCH 2/2] mm/page_alloc.c: use list_for_each_entry in mark_free

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Date:	Wed, 2 Dec 2015 17:32:27 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Geliang Tang <geliangtang@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mel Gorman <mgorman@...hsingularity.net>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <js1304@...il.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Alexander Duyck <alexander.h.duyck@...hat.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm/page_alloc.c: use list_for_each_entry in
 mark_free_pages()

On Wed 02-12-15 23:12:41, Geliang Tang wrote:
> Use list_for_each_entry instead of list_for_each + list_entry to
> simplify the code.
> 
> Signed-off-by: Geliang Tang <geliangtang@....com>

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

> ---
>  mm/page_alloc.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 0d38185..1c1ad58 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2027,7 +2027,7 @@ void mark_free_pages(struct zone *zone)
>  	unsigned long pfn, max_zone_pfn;
>  	unsigned long flags;
>  	unsigned int order, t;
> -	struct list_head *curr;
> +	struct page *page;
>  
>  	if (zone_is_empty(zone))
>  		return;
> @@ -2037,17 +2037,17 @@ void mark_free_pages(struct zone *zone)
>  	max_zone_pfn = zone_end_pfn(zone);
>  	for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
>  		if (pfn_valid(pfn)) {
> -			struct page *page = pfn_to_page(pfn);
> -
> +			page = pfn_to_page(pfn);
>  			if (!swsusp_page_is_forbidden(page))
>  				swsusp_unset_page_free(page);
>  		}
>  
>  	for_each_migratetype_order(order, t) {
> -		list_for_each(curr, &zone->free_area[order].free_list[t]) {
> +		list_for_each_entry(page,
> +				&zone->free_area[order].free_list[t], lru) {
>  			unsigned long i;
>  
> -			pfn = page_to_pfn(list_entry(curr, struct page, lru));
> +			pfn = page_to_pfn(page);
>  			for (i = 0; i < (1UL << order); i++)
>  				swsusp_set_page_free(pfn_to_page(pfn + i));
>  		}
> -- 
> 2.5.0
> 
> 
> --
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-- 
Michal Hocko
SUSE Labs
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