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

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Date:   Wed, 29 Sep 2021 12:54:51 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Michal Hocko <mhocko@...e.com>, Oscar Salvador <osalvador@...e.de>,
        Zi Yan <ziy@...dia.com>,
        Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 4/4] hugetlb: add hugetlb demote page support

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