[PATCH 0/4] ipc/sem.c: cleanup

[Manfred Spraul]

I did some cleanup in ipc/sem:
- ipc/sem contained hand-written linked lists, they can be replaced with
  standard list_head lists.
- the locking was written before CLONE_SYSVSEM was introduced, with
  ulp->lock, it's now possible to free undo structures during IPC_RMID
  immediately.
- There is a (extremely unlikely) race in semtimedop(), it can access
  kfree'd memory.

The patches pass my own simple test cases, what do you think?

--
	Manfred
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