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

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