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Subject[GIT PULL rcu/next] RCU commits for 3.4
Hello, Ingo,

The major features of this series are making RCU more aggressive about
entering dyntick-idle mode in order to improve energy efficiency,
converting a few more call_rcu()s to kfree_rcu()s, applying a number
of rcutree fixes and cleanups to rcutiny, removing CONFIG_SMP #ifdefs
from treercu, allowing RCU CPU stall times to be set via sysfs, adding
CPU-stall capability to rcutorture, adding more RCU-abuse diagnostics,
updating documentation, and fixing yet more issue located in the
still-ongoing top-to-bottom inspection of RCU, this time with a special
focus on the CPU-hotplug code path.

Three of the kfree_rcu() conversions have not yet received acks (s390,
tcm_fc, and mac80211), but the maintainers have been CCed on multiple
LKML postings and -next testing has not shown any problems.

These commits have been posted to LKML (
and and have received -next testing.
They are available in the git repository at:

git:// rcu/next

Thanx, Paul


Frederic Weisbecker (1):
rcu: Improve synchronize_rcu() diagnostics

Heiko Carstens (1):
rcu: Convert WARN_ON_ONCE() in rcu_lock_acquire() to lockdep

Hugh Dickins (1):
rcu: Stop spurious warnings from synchronize_sched_expedited

Julia Lawall (1):
PTR_ERR should be called before its argument is cleared.

Paul E. McKenney (44):
rcu: Bring RTFP.txt up to date.
rcu: Add lockdep-RCU checks for simple self-deadlock
rcu: Add diagnostic for misaligned rcu_head structures
rcu: Avoid waking up CPUs having only kfree_rcu() callbacks
rcu: Move RCU_TRACE to lib/Kconfig.debug
s390: Convert call_rcu() to kfree_rcu(), drop ext_int_hash_update()
tcm_fc: Convert call_rcu() to kfree_rcu(), drop ft_tport_rcu_free()
ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu()
ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu
mac80211: Convert call_rcu() to kfree_rcu(), drop mesh_gate_node_reclaim()
rcu: Simplify offline processing
rcu: Make rcutorture flag online/offline failures
rcu: Limit lazy-callback duration
rcu: Check for callback invocation from offline CPUs
rcu: Don't make callbacks go through second full grace period
rcu: Remove single-rcu_node optimization in rcu_start_gp()
rcu: Protect __rcu_read_unlock() against scheduler-using irq handlers
rcu: Streamline code produced by __rcu_read_unlock()
rcu: Prevent RCU callbacks from executing before scheduler initialized
rcu: Inform RCU of irq_exit() activity
rcu: Simplify unboosting checks
rcu: Clean up straggling rcu_preempt_needs_cpu() name
rcu: Check for idle-loop entry while in RCU read-side critical section
rcu: Make rcu_sleep_check() also check rcu_lock_map
rcu: Note that rcu_access_pointer() can be used for teardown
rcu: Remove #ifdef CONFIG_SMP from TREE_RCU
rcu: Set RCU CPU stall times via sysfs
rcu: Print scheduling-clock information on RCU CPU stall-warning messages
rcutorture: Permit holding off CPU-hotplug operations during boot
rcu: Make documentation give more realistic rcutorture duration
rcu: Add CPU-stall capability to rcutorture
rcu: Update stall-warning documentation
rcu: Check for illegal use of RCU from offlined CPUs
rcu: Move synchronize_sched_expedited() to rcutree.c
rcu: No interrupt disabling for rcu_prepare_for_idle()
lockdep: Add CPU-idle/offline warning to lockdep-RCU splat
rcu: Rework detection of use of RCU by offline CPUs
rcu: Call out dangers of expedited RCU primitives
rcu: Trace only after NULL-pointer check
rcu: Remove redundant check for rcu_head misalignment
rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()
rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections
rcu: Eliminate softirq-mediated RCU_FAST_NO_HZ idle-entry loop
rcu: Hold off RCU_FAST_NO_HZ after timer posted

Documentation/RCU/RTFP.txt | 1902 ++++++++++++++++++++++++++++++++++----
Documentation/RCU/checklist.txt | 14 +
Documentation/RCU/stallwarn.txt | 87 ++-
Documentation/RCU/torture.txt | 33 +-
Documentation/RCU/trace.txt | 36 +-
arch/s390/kernel/irq.c | 9 +-
drivers/target/tcm_fc/tfc_sess.c | 12 +-
include/linux/rcupdate.h | 83 ++-
include/linux/rcutiny.h | 10 +-
include/linux/rcutree.h | 19 +
include/linux/sched.h | 3 +-
include/linux/srcu.h | 15 +-
include/trace/events/rcu.h | 63 +-
init/Kconfig | 9 -
kernel/lockdep.c | 8 +-
kernel/rcu.h | 26 +-
kernel/rcupdate.c | 5 +
kernel/rcutiny.c | 26 +-
kernel/rcutiny_plugin.h | 77 ++-
kernel/rcutorture.c | 91 ++-
kernel/rcutree.c | 507 ++++++++---
kernel/rcutree.h | 27 +-
kernel/rcutree_plugin.h | 450 ++++++----
kernel/rcutree_trace.c | 12 +-
kernel/srcu.c | 33 +-
lib/Kconfig.debug | 24 +
net/ipv4/cipso_ipv4.c | 11 +-
net/ipv4/ip_sockglue.c | 7 +-
net/mac80211/mesh_pathtbl.c | 8 +-
29 files changed, 2965 insertions(+), 642 deletions(-)

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