Re: [PATCH v2 4/4] hugetlb: add hugetlb demote page support

[Mike Kravetz <mike.kravetz@xxxxxxxxxx>]

On 9/24/21 2:44 AM, David Hildenbrand wrote:
> On 23.09.21 19:53, Mike Kravetz wrote:
>> +
>> +    if (alloc_huge_page_vmemmap(h, page)) {
>> +        /* Allocation of vmemmmap failed, we can not demote page */
>> +        spin_lock_irq(&hugetlb_lock);
>> +        set_page_refcounted(page);
>> +        add_hugetlb_page(h, page, false);
> 
> I dislike using 0/1 as return values as it will just hide the actual issue.
> 
> This here would be -ENOMEM, right?
> 

I will pass along the return value from alloc_huge_page_vmemmap().  You
are right, -ENOMEM is the only non-zero value.

Thanks,
-- 
Mike Kravetz