UREG_I4
args.child_tid = compat_ptr(regs->u_regs[UREG_I4]);
args.child_tid = (int __user *)regs->u_regs[UREG_I4];
unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
#define __PT_PARM5_REG u_regs[UREG_I4]