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    Subject[PATCH RFC 0/41] RCU commits for 3.4
    Hello!

    This patchset makes RCU more aggressive about entering dyntick-idle mode
    in order to improve energy efficiency, converts a few more call_rcu()s to
    kfree_rcu(), applies a number of rcutree fixes and cleanups to rcutiny,
    removes CONFIG_SMP #ifdef from treercu, allows RCU CPU stall times to
    be set via sysfs, add CPU-stall capability to rcutorture, adds more
    RCU-abuse diagnostics, updates documentation, and yet more fixes from
    the still-ongoing top-to-bottom inspection of RCU with a special focus
    on the CPU-hotplug code path. The patches are as follows:

    1,26,41,40.
    Documentation upgrades.
    2. Improve synchronize_rcu() diagnostics, courtesy of
    Frederic Weisbecker.
    3. Add lockdep-RCU checks for simple self deadlock, such as calling
    synchronize_rcu() while in an RCU read-side critical section.
    4. Add a diagnostic for misaligned rcu_head structures. This is
    preparation for a call_rcu_lazy() for added energy efficiency.
    5,14,36.
    Upgrades to CONFIG_RCU_FAST_NO_HZ.
    6. Move CONFIG_RCU_TRACE to lib/Kconfig.debug: not for production use.
    7-11. Convert several call_rcu() primitives to kfree_rcu().
    12,13,15,16,37-39.
    Fixes to and streamlining of CPU-hotplug handling based on review.
    17. Remove dubious single-rcu_node optimization from rcu_start_gp().
    18-22. Apply prior rcutree fixes to rcutiny.
    23. Catch rcu_preempt_needs_cpu()'s name up with 2011.
    24. Check for idle-loop entry while in an RCU read-side critical section.
    25. Check for sleeping in TREE_RCU read-side critical sections.
    27,35. Remove "#ifdef CONFIG_SMP" from treercu, move code accordingly.
    28. Allow RCU CPU stall times to be adjusted at runtime via sysfs.
    29. Print scheduling-clock timer information on RCU CPU stall warning
    messages if requested by CONFIG_RCU_CPU_STALL_INFO config parameter.
    30. Allow rcutorture to be told to hold off CPU-hotplug operations during
    early boot.
    31. Allow rcutorture to generate CPU stalls in order to test RCU CPU
    stall warning facility.
    33. Silence module-parameter warnings by converting a couple of
    rcutorture's module parameters to bool.
    34. Check for illegal use of RCU from offlined CPUs.
    41. Fix misplaced NULL-pointer check in rcutorture.

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

    git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev

    Thanx, Paul

    ------------------------------------------------------------------------

    Documentation/RCU/torture.txt | 18
    b/Documentation/RCU/RTFP.txt | 1910 ++++++++++++++++++++++++++++++++++---
    b/Documentation/RCU/checklist.txt | 14
    b/Documentation/RCU/stallwarn.txt | 85 +
    b/Documentation/RCU/torture.txt | 15
    b/Documentation/RCU/trace.txt | 36
    b/arch/s390/kernel/irq.c | 9
    b/drivers/target/tcm_fc/tfc_sess.c | 12
    b/include/linux/rcupdate.h | 2
    b/include/linux/rcutiny.h | 6
    b/include/linux/rcutree.h | 1
    b/include/linux/sched.h | 3
    b/include/linux/srcu.h | 11
    b/include/trace/events/rcu.h | 63 -
    b/init/Kconfig | 9
    b/kernel/lockdep.c | 8
    b/kernel/rcu.h | 4
    b/kernel/rcupdate.c | 5
    b/kernel/rcutiny.c | 3
    b/kernel/rcutiny_plugin.h | 4
    b/kernel/rcutorture.c | 4
    b/kernel/rcutree.c | 6
    b/kernel/rcutree.h | 3
    b/kernel/rcutree_plugin.h | 3
    b/kernel/rcutree_trace.c | 8
    b/kernel/srcu.c | 4
    b/lib/Kconfig.debug | 9
    b/net/ipv4/cipso_ipv4.c | 11
    b/net/ipv4/ip_sockglue.c | 7
    b/net/mac80211/mesh_pathtbl.c | 8
    include/linux/rcupdate.h | 40
    include/linux/rcutiny.h | 4
    include/linux/rcutree.h | 18
    kernel/rcutiny.c | 4
    kernel/rcutiny_plugin.h | 72 +
    kernel/rcutorture.c | 83 +
    kernel/rcutree.c | 641 ++++++++----
    kernel/rcutree.h | 24
    kernel/rcutree_plugin.h | 443 +++++---
    kernel/rcutree_trace.c | 6
    kernel/srcu.c | 27
    lib/Kconfig.debug | 14
    42 files changed, 2954 insertions(+), 703 deletions(-)



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