On Mon, Feb 18, 2019 at 10:32:05PM -0700, Yu Zhao wrote: > pgtable_pmd_page_ctor() must be used on user pmd. For kernel pmd, > it's okay to use pgtable_page_ctor() instead only because kernel > doesn't have thp.
I'm not sure that's true. I think you can create THPs in vmalloc these days. See HAVE_ARCH_HUGE_VMAP which is supported by arm64.
