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Date: Fri, 14 Jul 2017 14:31:50 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v12 7/8] mm: export symbol of next_zone and
 first_online_pgdat
Message-ID: <20170714123150.GB2624@dhcp22.suse.cz>
References: <1499863221-16206-1-git-send-email-wei.w.wang@intel.com>
 <1499863221-16206-8-git-send-email-wei.w.wang@intel.com>
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Sender: owner-linux-mm@kvack.org
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To: Wei Wang <wei.w.wang@intel.com>
Cc: linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-mm@kvack.org, mst@redhat.com, david@redhat.com, cornelia.huck@de.ibm.com, akpm@linux-foundation.org, mgorman@techsingularity.net, aarcange@redhat.com, amit.shah@redhat.com, pbonzini@redhat.com, liliang.opensource@gmail.com, virtio-dev@lists.oasis-open.org, yang.zhang.wz@gmail.com, quan.xu@aliyun.com

On Wed 12-07-17 20:40:20, Wei Wang wrote:
> This patch enables for_each_zone()/for_each_populated_zone() to be
> invoked by a kernel module.

This needs much better justification with an example of who is going to
use these symbols and what for.
 
> Signed-off-by: Wei Wang <wei.w.wang@intel.com>
> ---
>  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
> 
> --
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-- 
Michal Hocko
SUSE Labs

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