xen_ptep_modify_prot_start 1275 arch/x86/xen/enlighten_pv.c 			xen_ptep_modify_prot_start;
xen_ptep_modify_prot_start   20 arch/x86/xen/mmu.h pte_t xen_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);