linux-kernel - Re: [PATCH] mm: fix dubious code in __count_immobile

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Message-Id: <20110221185757.85dcaaf1.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 21 Feb 2011 18:57:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix dubious code in __count_immobile_pages()

On Fri, 18 Feb 2011 10:46:26 +0900
Namhyung Kim <namhyung@...il.com> wrote:

> When pfn_valid_within() failed 'iter' was incremented twice.
> 
> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thank you.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


> ---
>  mm/page_alloc.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index e8b02771ccea..bf83d1c1d648 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5380,10 +5380,9 @@ __count_immobile_pages(struct zone *zone, struct page *page, int count)
>  	for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) {
>  		unsigned long check = pfn + iter;
>  
> -		if (!pfn_valid_within(check)) {
> -			iter++;
> +		if (!pfn_valid_within(check))
>  			continue;
> -		}
> +
>  		page = pfn_to_page(check);
>  		if (!page_count(page)) {
>  			if (PageBuddy(page))
> -- 
> 1.7.4
> 
> 

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