linux-kernel - Re: [virtio-dev] Re: [PATCH v12 7/8] mm: export symbol of next_zone and first_online

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Date:   Thu, 13 Jul 2017 16:41:54 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
CC:     linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, david@...hat.com, cornelia.huck@...ibm.com,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        aarcange@...hat.com, amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com, virtio-dev@...ts.oasis-open.org,
        yang.zhang.wz@...il.com, quan.xu@...yun.com
Subject: Re: [virtio-dev] Re: [PATCH v12 7/8] mm: export symbol of next_zone
 and first_online_pgdat

On 07/13/2017 08:16 AM, Michael S. Tsirkin wrote:
> 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.

With this patch, other kernel modules can also use the for_each_zone().
Would it be better to claim it broader?

>
>> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> balloon seems to only use
> +       for_each_populated_zone(zone)
> +               for_each_migratetype_order(order, type)
>

Yes. using for_each_populated_zone() requires the following export.

Best,
Wei
>> ---
>>   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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