PGTABLE_HIGHMEM 103 arch/arm/include/asm/pgalloc.h pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM); PGTABLE_HIGHMEM 22 arch/x86/mm/pgtable.c gfp_t __userpte_alloc_gfp = GFP_PGTABLE_USER | PGTABLE_HIGHMEM;