Preemptible-RCU updates for 3.20
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| Patch | Paul E. McKenney | Davidlohr Bueso |
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Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH tip/core/rcu 0/14] Preemptible-RCU updates for 3.20
Hello!
This series fixes some problems in preemptible RCU.
1. Protect rcu_boost() lockless accesses with ACCESS_ONCE().
2-11. Fix a low-probability long-standing bug in preemptible RCU that
could occur in systems with more than 16 CPUs, but only if a full bank of 16 CPUs (as in 0-15, 16-31, 32-47, ...) was taken offline. See http://paulmck.livejournal.com/37782.html for more details.
12. Revert old commit that worked around an rt_mutex bug. This old
commit could cause priority inversion, and the rt_mutex bug has long since been fixed. Courtesy of Lai Jiangshan.
13. Simplify grace-period code, enabled by 2-11 above.
14. Remove redundant RCU callback list initialization.
Thanx, Paul
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b/kernel/rcu/tree.c | 115 +++++++++++++------------- b/kernel/rcu/tree.h | 24 ----- b/kernel/rcu/tree_plugin.h | 196 ++++++++++----------------------------------- 3 files changed, 102 insertions(+), 233 deletions(-)