Re: [PATCH v12 7/8] mm: export symbol of next_zone and first_online_pgdat

[Michael S. Tsirkin]

On Wed, Jul 12, 2017 at 08:40:20PM +0800, Wei Wang wrote:
> This patch enables for_each_zone()/for_each_populated_zone() to be
> invoked by a kernel module.

... for use by virtio balloon.

> Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>

balloon seems to only use
+       for_each_populated_zone(zone)
+               for_each_migratetype_order(order, type)


> ---
>  mm/mmzone.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/mmzone.c b/mm/mmzone.c
> index a51c0a6..08a2a3a 100644
> --- a/mm/mmzone.c
> +++ b/mm/mmzone.c
> @@ -13,6 +13,7 @@ struct pglist_data *first_online_pgdat(void)
>  {
>  	return NODE_DATA(first_online_node);
>  }
> +EXPORT_SYMBOL_GPL(first_online_pgdat);
>  
>  struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
>  {
> @@ -41,6 +42,7 @@ struct zone *next_zone(struct zone *zone)
>  	}
>  	return zone;
>  }
> +EXPORT_SYMBOL_GPL(next_zone);
>  
>  static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
>  {
> -- 
> 2.7.4