tree 4f0b51423d81013796d0ef18a5afdedce5e09d3e
parent a5a2889544997d3909480d6d27e2559875226532
author Joel Fernandes (Google) <joel@joelfernandes.org> 1529868891 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1535558070 -0700

doc: Improve rcu_dynticks::dynticks documentation

The very useful RCU Data-Structures describes that the dynticks counter
of the rcu_dynticks data structure is incremented when we transitions to
or from dynticks-idle mode. However it doesn't mention that it is also
incremented due to transitions to and from user mode which for dynticks
purposes is an extended quiescent state.

I found this with tracing calls to rcu_dynticks_eqs_enter which can also
happen from rcu_user_enter. Lets add this information to the
Data-Structures document.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>