tree a07a5d2f1c4f73dc8a54cd6b8a9bc6f7371e2ded
parent d382627137e2a7a2ec34efc734788fbfeb95d1cf
author Paul E. McKenney <paul.mckenney@linaro.org> 1348270525 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1348413306 -0700

rcu: Dump number of callbacks in stall warning messages

In theory, if a grace period manages to get started despite there being
no callbacks on any of the CPUs, all CPUs could go into dyntick-idle
mode, so that the grace period would never end.  This commit updates
the RCU CPU stall warning messages to detect this condition by summing
up the number of callbacks on all CPUs.

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