linux-kernel - Re: [PATCH v4] numa: make node_to_cpumask_map() NUMA_NO

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Message-ID: <c3a90839-703e-718a-a489-9905e52bbc46@huawei.com>
Date:   Mon, 16 Sep 2019 20:55:01 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Michal Hocko <mhocko@...nel.org>
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Subject: Re: [PATCH v4] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

On 2019/9/16 20:23, Michal Hocko wrote:
> On Mon 16-09-19 20:07:22, Yunsheng Lin wrote:
> [...]
>>>> @@ -861,9 +861,12 @@ void numa_remove_cpu(int cpu)
>>>>   */
>>>>  const struct cpumask *cpumask_of_node(int node)
>>>>  {
>>>> -	if (node >= nr_node_ids) {
>>>> +	if (node == NUMA_NO_NODE)
>>>> +		return cpu_online_mask;
>>>> +
>>>> +	if ((unsigned int)node >= nr_node_ids) {
>>>>  		printk(KERN_WARNING
>>>> -			"cpumask_of_node(%d): node > nr_node_ids(%u)\n",
>>>> +			"cpumask_of_node(%d): node >= nr_node_ids(%u)\n",
>>>>  			node, nr_node_ids);
>>>>  		dump_stack();
>>>>  		return cpu_none_mask;
>>>
>>> Why do we need this?
>>
>> As the commit log says, the above cpumask_of_node() is for debugging,
>> it should catch other "node < 0" cases except NUMA_NO_NODE.
> 
> OK, I would just make it a separate patch.

Ok, thanks.

>