generic hashtable implementation

There are quite a few places in the kernel which implement a hashtable
in a very similar way. Instead of having implementations of a hashtable
all over the kernel, we can re-use the code.

This patch series introduces a very simple hashtable implementation, and
modifies three (random) modules to use it. I've limited it to 3 only
so that it would be easy to review and modify, and to show that even
at this number we already eliminate a big amount of duplicated code.

If this basic hashtable looks ok, future code will include:

 - RCU support
 - Self locking (list_bl?)
 - Converting more code to use the hashtable


Sasha Levin (4):
  hashtable: introduce a small and naive hashtable
  user_ns: use new hashtable implementation
  mm,ksm: use new hashtable implementation
  workqueue: use new hashtable implementation

 include/linux/hashtable.h      |   46 ++++++++++++++++++++
 include/linux/user_namespace.h |   11 +++--
 kernel/user.c                  |   54 ++++-------------------
 kernel/user_namespace.c        |    4 +-
 kernel/workqueue.c             |   91 ++++++---------------------------------
 mm/ksm.c                       |   29 ++++---------
 6 files changed, 87 insertions(+), 148 deletions(-)
 create mode 100644 include/linux/hashtable.h

-- 
1.7.8.6

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