linux-kernel - Re: [PATCH 7/7] mm/mmzone: refactor memmap_valid

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Date:	Mon, 16 Nov 2015 13:45:01 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Yaowei Bai <baiyaowei@...s.chinamobile.com>
Cc:	akpm@...ux-foundation.org, bhe@...hat.com,
	dan.j.williams@...el.com, dave.hansen@...ux.intel.com,
	dave@...olabs.net, dhowells@...hat.com, dingel@...ux.vnet.ibm.com,
	hannes@...xchg.org, hillf.zj@...baba-inc.com, holt@....com,
	iamjoonsoo.kim@....com, joe@...ches.com, kuleshovmail@...il.com,
	mgorman@...e.de, mike.kravetz@...cle.com,
	n-horiguchi@...jp.nec.com, penberg@...nel.org, rientjes@...gle.com,
	sasha.levin@...cle.com, tj@...nel.org, tony.luck@...el.com,
	vbabka@...e.cz, vdavydov@...allels.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] mm/mmzone: refactor memmap_valid_within

On Mon 16-11-15 14:51:26, Yaowei Bai wrote:
[...]
> @@ -72,16 +72,10 @@ struct zoneref *next_zones_zonelist(struct zoneref *z,
>  }
>  
>  #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
> -int memmap_valid_within(unsigned long pfn,
> +bool memmap_valid_within(unsigned long pfn,
>  					struct page *page, struct zone *zone)
>  {
> -	if (page_to_pfn(page) != pfn)
> -		return 0;
> -
> -	if (page_zone(page) != zone)
> -		return 0;
> -
> -	return 1;
> +	return page_to_pfn(page) == pfn && page_zone(page) == zone;

I do not think this is easier to read. Quite contrary

>  }
>  #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
>  
> -- 
> 1.9.1
> 
> 

-- 
Michal Hocko
SUSE Labs
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