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Subject: Re: [Patch v3] mm/page_alloc.c: use NODE_MASK_NONE define used_mask
To:     John Hubbard <jhubbard@nvidia.com>,
        Wei Yang <richard.weiyang@gmail.com>, akpm@linux-foundation.org
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org, jgg@ziepe.ca,
        bhe@redhat.com
References: <20200329024217.5199-1-richard.weiyang@gmail.com>
 <8d6a1cd3-75cf-78c3-b83b-c5208a209f65@nvidia.com>
From:   David Hildenbrand <david@redhat.com>
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Date:   Mon, 30 Mar 2020 17:00:51 +0200
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On 29.03.20 06:00, John Hubbard wrote:
> On 3/28/20 7:42 PM, Wei Yang wrote:
>> For all 0 nodemask_t, we have already define macro NODE_MASK_NONE.
>> Leverage this to define an all clear nodemask.
> 
> It would be a little clearer if you used wording more like this:
> 
> Subject: [Patch v3] mm/page_alloc.c: use NODE_MASK_NONE in build_zonelists()
> 
> Slightly simplify the code by initializing user_mask with
> NODE_MASK_NONE, instead of later calling nodes_clear(). This saves
> a line of code.
> 
> 
>>
>> Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
>>
>> ---
>> v3: adjust the commit log a little
>> v2: use NODE_MASK_NONE as suggested by David Hildenbrand
>> ---
>>   mm/page_alloc.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index ef790dfad6aa..dfcf2682ed40 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -5587,14 +5587,13 @@ static void build_zonelists(pg_data_t *pgdat)
>>   {
>>   	static int node_order[MAX_NUMNODES];
>>   	int node, load, nr_nodes = 0;
>> -	nodemask_t used_mask;
>> +	nodemask_t used_mask = NODE_MASK_NONE;
>>   	int local_node, prev_node;
>>   
>>   	/* NUMA-aware ordering of nodes */
>>   	local_node = pgdat->node_id;
>>   	load = nr_online_nodes;
>>   	prev_node = local_node;
>> -	nodes_clear(used_mask);
>>   
>>   	memset(node_order, 0, sizeof(node_order));
>>   	while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
>>
> 
> Honestly, I don't think it's really worth doing a patch for this, but
> there's nothing wrong with the diff, so:
> 
> Reviewed-by: John Hubbard <jhubbard@nvidia.com>

With the changed subject/description

Reviewed-by: David Hildenbrand <david@redhat.com>


-- 
Thanks,

David / dhildenb