linux-kernel - Re: [PATCH V2] hyper-v: use GFP_KERNEL for hv_context.hv_numa

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Date:   Tue, 19 Dec 2017 16:40:35 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] hyper-v: use GFP_KERNEL for hv_context.hv_numa_map


On 2017/12/19 1:05, Stephen Hemminger wrote:
> On Mon, 18 Dec 2017 17:02:52 +0800
> Jia-Ju Bai <baijiaju1990@...il.com> wrote:
>
>> The kzalloc function is called with GFP_ATOMIC.
>> But according to driver call graph, it is not in atomic context,
>> namely no spinlock is held nor in an interrupt handler.
>>
>> This GFP_ATOMIC is unnecessary, and replace with GFP_KERNEL.
>>
>> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
>> ---
>>   drivers/hv/hv.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
>> index 8267439..b0d025a 100644
>> --- a/drivers/hv/hv.c
>> +++ b/drivers/hv/hv.c
>> @@ -150,7 +150,7 @@ int hv_synic_alloc(void)
>>   	int cpu;
>>   
>>   	hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
>> -					 GFP_ATOMIC);
>> +					 GFP_KERNEL);
>>   	if (hv_context.hv_numa_map == NULL) {
>>   		pr_err("Unable to allocate NUMA map\n");
>>   		goto err;
> Thanks, for fixing this.
> While you are at it; wouldn't it make sense to use kcalloc here?

I think kcalloc can be used here.


Thanks,
Jia-Ju Bai