uio hotplug support

Implement the ability to hotunplug a uio device while file handles
are still open without crashing.

I have written the code very carefully, and this survives my
basic testing.  So at the very least this is better than
what is present in uio today.

I have implemented the ``locking'' for hotunplug support in
a generic library, that should be reusable to make this
kind of support easier to add in other pieces of the kernel.

Eric W. Biederman (5):
      uio: Simplify the lifetime logic of struct uio_device.
      uio: Kill unused vma_count.
      uio: Remove unused uio_info mmap method.
      libunload: A library to help remove open files
      uio: Implement hotunplug support, using libunload

---
 drivers/uio/uio.c          |  326 ++++++++++++++++++++++++++++++--------------
 fs/Makefile                |    2 +-
 fs/libunload.c             |  166 ++++++++++++++++++++++
 include/linux/uio_driver.h |   11 +--
 include/linux/unload.h     |   33 +++++
 5 files changed, 426 insertions(+), 112 deletions(-)
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