linux-kernel - Re: [PATCH 1/5] page_isolation: Fix a comment typo in test_pages

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Date:	Thu, 20 Jun 2013 21:17:51 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	bcrl@...ck.org, akpm@...ux-foundation.org, hpa@...or.com,
	trivial@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] page_isolation: Fix a comment typo in test_pages_isolated()

On 06/20/2013 06:10 PM, Tang Chen wrote:
> pageblock_nr_page should be pageblock_nr_pages, and fist is
> a typo of first.
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>  mm/page_isolation.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index 383bdbb..0cee10f 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -226,9 +226,9 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
>  	int ret;
>  
>  	/*
> -	 * Note: pageblock_nr_page != MAX_ORDER. Then, chunks of free page
> -	 * is not aligned to pageblock_nr_pages.
> -	 * Then we just check pagetype fist.
> +	 * Note: pageblock_nr_pages != MAX_ORDER. Then, chunks of free pages

pageblock_nr_pages is the count of pages while MAX_ORDER is a order. Here
may be pageblock_order != MAX_ORDER.

> +	 * are not aligned to pageblock_nr_pages.
> +	 * Then we just check migratetype first.
>  	 */
>  	for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
>  		page = __first_valid_page(pfn, pageblock_nr_pages);
> @@ -238,7 +238,7 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
>  	page = __first_valid_page(start_pfn, end_pfn - start_pfn);
>  	if ((pfn < end_pfn) || !page)
>  		return -EBUSY;
> -	/* Check all pages are free or Marked as ISOLATED */
> +	/* Check all pages are free or marked as ISOLATED */
>  	zone = page_zone(page);
>  	spin_lock_irqsave(&zone->lock, flags);
>  	ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn,


-- 
Thanks.
Zhang Yanfei
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