__PAGE_KERNEL_RO
#define PAGE_KERNEL_RO __pgprot_page_mask(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_RO __pgprot_mask(__PAGE_KERNEL_RO | _ENC)
pte = __pte(__pa(stack_page) | ((__PAGE_KERNEL_RO | _PAGE_ENC) & ptemask));
pte_prot = __pgprot(__PAGE_KERNEL_RO & ~_PAGE_GLOBAL);
prot = __pgprot(__PAGE_KERNEL_RO | _PAGE_ENC);