title: How to wake up a user mode sleep process in kernel?
body: <p>I want to wake up a user-mode process in kernel . The process is blocked by calling sleep() in user mode . I called function wake_up_process() in kernel , but the process did not wake up after the wake_up_process() call.  I do not know why .
  Does anyone know how to wake up a user-mode sleep process in kernel ?  Thank you .</p>