eventfd enhancements for irqfd/iosignalfd

(Applies to kvm.git/master:c27b64a0)

For more details, please read the patch headers. This series adds a new feature to eventfd (explicit notifications) which addresses wqh based limitations, as well as provides fixes for several issues in irqfd pointed out by Michael Tsirkin. You can find reference to these issues here:

http://lkml.org/lkml/2009/6/15/218
http://lkml.org/lkml/2009/6/11/249

This series has been tested against the kvm-eventfd unit test, and appears to be functioning properly. You can download this test here:

ftp://ftp.novell.com/dev/ghaskins/kvm-eventfd.tar.bz2

---

Gregory Haskins (2):
eventfd: add module reference counting support for registered notifiers
eventfd: add an explicit srcu based notifier interface

 fs/eventfd.c            |  123 ++++++++++++++++++++++++++++++++++++++++++++---
 include/linux/eventfd.h |   33 +++++++++++++
 virt/kvm/eventfd.c      |  114 ++++++++++++++++++++------------------------
 3 files changed, 199 insertions(+), 71 deletions(-)

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