KSTK_EIP
unsigned long pc = KSTK_EIP(tsk);
eip = KSTK_EIP(task);
in_compat_syscall(), KSTK_EIP(current), code);
info.si_call_addr = (void __user *)KSTK_EIP(current);
sd->instruction_pointer = KSTK_EIP(task);
info.si_call_addr = (void __user *)KSTK_EIP(current);