[openib-general] [PATCH][uverbs] use get_task_mm

[Roland Dreier]

    Roland> I guess this patch can't hurt but can the mm really go
    Roland> away?  The only time we will call ib_umem_get() is during
    Roland> a write system call (which requires an open file,
    Roland> obviously).  Can current->mm go away before all files are
    Roland> closed?

I didn't phrase this precisely as I meant.  Can current->mm go away
during a system call for current's task?

 - R.