tree 858163c4983a7cc92bffab2267597f3bb802071b
parent 9bc8b5586f94be6391458074ecbba8827ba8ba9d
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1313362614 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1317271122 -0700

rcu: Avoid having just-onlined CPU resched itself when RCU is idle

CPUs set rdp->qs_pending when coming online to resolve races with
grace-period start.  However, this means that if RCU is idle, the
just-onlined CPU might needlessly send itself resched IPIs.  Adjust
the online-CPU initialization to avoid this, and also to correctly
cause the CPU to respond to the current grace period if needed.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Josh Boyer <jwboyer@redhat.com>
Tested-by: Christian Hoffmann <email@christianhoffmann.info>