VM_FAULT_USER_WIRE
(fs.fault_flags & VM_FAULT_WIRE_MASK) != VM_FAULT_USER_WIRE)
fault_flags = VM_FAULT_USER_WIRE;
(fs.fault_flags & VM_FAULT_WIRE_MASK) != VM_FAULT_USER_WIRE)
#define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)