tree b5fde68e681dc589e40347ee939a1433d70bd77a
parent 0d43eb34f9aabcddf41c99b7af2d0ced33e9a3cc
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1438899417 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1442808981 -0700

rcu: Make ->cpu_no_qs be a union for aggregate OR

This commit converts the rcu_data structure's ->cpu_no_qs field
to a union.  The bytewise side of this union allows individual access
to indications as to whether this CPU needs to find a quiescent state
for a normal (.norm) and/or expedited (.exp) grace period.  The setwise
side of the union allows testing whether or not a quiescent state is
needed at all, for either type of grace period.

For now, only .norm is used.  A later commit will introduce the expedited
usage.

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