Re: [RFC PATCH 6/6] powerpc/kvm: change the condition of identifying hugetlb vm

[Scott Wood]

On Wed, 2015-06-10 at 14:27 +0800, Wenwei Tao wrote:
> Hugetlb VMAs are not mergeable, that means a VMA couldn't have VM_HUGETLB 
> and
> VM_MERGEABLE been set in the same time. So we use VM_HUGETLB to indicate new
> mergeable VMAs. Because of that a VMA which has VM_HUGETLB been set is a 
> hugetlb
> VMA only if it doesn't have VM_MERGEABLE been set in the same time.

Eww.

If you must overload such bit combinations, please hide it behind a 
vm_is_hugetlb() function.

-Scott

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