Andrew, Rusty,

Here is the patch which addresses RCU alloc problem araised by Rusty. 
It replaced the mempool  with Rusty's "RCU allocating RCU structure with
the object-to-be-freed together" solution.  Patch is for 2.5.44-mm6,
compiled and tested.

Please review and apply if you like.

Mingming
--------------------------------------------------------------------------------
msg.c  |    2 -
sem.c  |    6 +--
shm.c  |    2 -
util.c |  104
++++++++++++++++++++++++++++++++++-------------------------------
util.h |   23 ++++++++++----
5 files changed, 77 insertions(+), 60 deletions(-)