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Date:   Fri, 20 Nov 2020 10:15:30 +0100
From:   David Hildenbrand <>
To:     Michal Hocko <>,
        Muchun Song <>
Subject: Re: [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct
 page size is not power of two

On 20.11.20 09:25, Michal Hocko wrote:
> On Fri 20-11-20 14:43:25, Muchun Song wrote:
>> We only can free the unused vmemmap to the buddy system when the
>> size of struct page is a power of two.
> Can we actually have !power_of_2 struct pages?

AFAIK multiples of 8 bytes (56, 64, 72) are possible.


David / dhildenb

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