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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