rcu: Move synchronize_sched_expedited() state to rcu_state

Tracing (debugfs) of expedited RCU primitives is required, which in turn
requires that the relevant data be located where the tracing code can find
it, not in its current static global variables in kernel/rcutree.c.
This commit therefore moves sync_sched_expedited_started and
sync_sched_expedited_done to the rcu_state structure, as fields
->expedited_start and ->expedited_done, respectively.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index a7c945d149cf..88f3d9d5971d 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -404,6 +404,9 @@ struct rcu_state {
                                                 /*  _rcu_barrier(). */
         /* End of fields guarded by barrier_mutex. */
 
+        atomic_long_t expedited_start;          /* Starting ticket. */
+        atomic_long_t expedited_done;           /* Done ticket. */
+
         unsigned long jiffies_force_qs;         /* Time at which to invoke */
                                                 /*  force_quiescent_state(). */
         unsigned long n_force_qs;               /* Number of calls to */