linux-kernel - Re: [PATCH 6/7] mm/gfp: make gfp_zonelist return directly and bool

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Date:	Mon, 16 Nov 2015 21:44:11 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
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, mhocko@...e.cz, mike.kravetz@...cle.com,
	n-horiguchi@...jp.nec.com, penberg@...nel.org,
	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 6/7] mm/gfp: make gfp_zonelist return directly and bool

On Tue, 17 Nov 2015, Yaowei Bai wrote:

> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 6523109..14a6249 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -378,9 +378,9 @@ static inline enum zone_type gfp_zone(gfp_t flags)
>  static inline int gfp_zonelist(gfp_t flags)
>  {
>         if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE))
> -               return 1;
> +               return ZONELIST_NOFALLBACK;
>  
> -       return 0;
> +       return ZONELIST_FALLBACK;
>  }
>  
>  /*
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index e23a9e7..9664d6c 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -576,8 +576,6 @@ static inline bool zone_is_empty(struct zone *zone)
>  /* Maximum number of zones on a zonelist */
>  #define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES)
>  
> -#ifdef CONFIG_NUMA
> -
>  /*
>   * The NUMA zonelists are doubled because we need zonelists that restrict the
>   * allocations to a single node for __GFP_THISNODE.
> @@ -585,10 +583,13 @@ static inline bool zone_is_empty(struct zone *zone)
>   * [0] : Zonelist with fallback
>   * [1] : No fallback (__GFP_THISNODE)
>   */
> -#define MAX_ZONELISTS 2
> -#else
> -#define MAX_ZONELISTS 1
> +enum {
> +       ZONELIST_FALLBACK,
> +#ifdef CONFIG_NUMA
> +       ZONELIST_NOFALLBACK,
>  #endif
> +       MAX_ZONELISTS
> +};
>  
>  /*
>   * This struct contains information about a zone in a zonelist. It is stored

This is a different change than the original.  I don't see a benefit from 
it, but I have no strong feelings on it.  If someone else finds value in 
this, please update the comment when defining the enum as well.
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