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Subject[PATCH tip/core/rcu 0/14] Preview of RCU patches for 2.6.39

This patchset fixes a few bugs and introduces some of the infrastructure
for TREE_RCU priority boosting. If testing goes well, TREE_RCU priority
boosting itself might make it as well. The patches are as follows:

1. call __rcu_read_unlock() in exit_rcu for tiny RCU to preserve
debug state (from Lai Jiangshan).
2. Get rid of duplicate sched.h include from rcutorture.c
(from Jesper Juhl).
3. Add documentation saying which RCU flavor to choose.
4. Remove dead code from DEBUG_OBJECTS_RCU_HEAD implementation
(from Amerigo Wang).
5. Document transitivity for memory barriers.
6. Remove conditional compilation for RCU CPU stall warnings.
(These can now be controlled by boot/module parameters.)
7. Decrease memory-barrier usage based on semi-formal proof.
Expedited RCU has invalidated an assumption that the old
dyntick-idle interface depended on, and here is a fix. I
am still working on a lighter-weight fix, but safety first!
8. Merge TREE_PREEPT_RCU blocked_tasks[] lists, which is a first
step towards TREE_RCU priority boosting.
9. Update documentation to reflect blocked_tasks[] merge.
10. move TREE_RCU from softirq to kthread, which is a second step
towards TREE_RCU priority boosting.

For a testing-only version of this patchset from git, please see the
following subject-to-rebase branch:

git:// rcu/testing

I am more confident in the first five of the above patches, which are
available at:

git:// rcu/next

Thanx, Paul

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