irqfd fixes/enhancements

(Applies to kvm.git/master:c27b64a0)

The following series represents my queue of fixes for issues in irqfd, 
which include enhancements to eventfd.  This is a respin of the patches
originally proposed yesterday, called "[KVM-RFC PATCH 0/2] eventfd
enhancements for irqfd/iosignalfd", which you can find a link to the thread
here:

http://www.gossamer-threads.com/lists/linux/kernel/1091852

Aside from introducing a few minor fixes (patches 1/4, 2/4), the general
solution for module reference counting has been extracted from the
(controversial) SRCU enhancement.  We can address the SRCU topic at a later
time.  For now, fixing the race condition is a higher priority item IMO.
Hopefully, this more focused series is more palatable for the
reviewers/maintainers involved.

---

Gregory Haskins (4):
      eventfd: add module reference counting support for registered notifiers
      eventfd: add generalized notifier interface
      KVM: fix irqfd error checking
      KVM: update inaccurate irqfd comment


 fs/eventfd.c            |   77 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/eventfd.h |   37 +++++++++++++++++++++
 virt/kvm/eventfd.c      |   82 ++++++++++++++++++-----------------------------
 3 files changed, 146 insertions(+), 50 deletions(-)

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