PAGE_KERNEL_RWX
set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
prot = PAGE_KERNEL_RWX;
PAGE_KERNEL_RWX, enable_read_write ? 1:0);
PAGE_KERNEL_RWX, 1);
.pgprot = PAGE_KERNEL_RWX,