tree 328b746af71b47c4af97e6ea06dc24b12528a955
parent d14aada8e20bdf81ffd43f433b123972cf575b32
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1272254669 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1273514915 -0700

rcu: RCU_FAST_NO_HZ must check RCU dyntick state

The current version of RCU_FAST_NO_HZ reproduces the old CLASSIC_RCU
dyntick-idle bug, as it fails to detect CPUs that have interrupted
or NMIed out of dyntick-idle mode.  Fix this by making rcu_needs_cpu()
check the state in the per-CPU rcu_dynticks variables, thus correctly
detecting the dyntick-idle state from an RCU perspective.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>