rcu: Move rcu_barrier_completion to rcu_state structure

In order to allow each RCU flavor to concurrently execute its
rcu_barrier() function, it is necessary to move the relevant
state to the rcu_state structure.  This commit therefore moves the
rcu_barrier_completion global variable to a new ->barrier_completion
field in the rcu_state structure.

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

1 files changed, 4 insertions, 5 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 5929b021666d..ca7d1678ac79 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -158,7 +158,6 @@ unsigned long rcutorture_vernum;
 /* State information for rcu_barrier() and friends. */
 
 static DEFINE_MUTEX(rcu_barrier_mutex);
-static struct completion rcu_barrier_completion;
 
 /*
  * Return true if an RCU grace period is in progress.  The ACCESS_ONCE()s
@@ -2275,7 +2274,7 @@ static void rcu_barrier_callback(struct rcu_head *rhp)
         struct rcu_state *rsp = rdp->rsp;
 
         if (atomic_dec_and_test(&rsp->barrier_cpu_count))
-                complete(&rcu_barrier_completion);
+                complete(&rsp->barrier_completion);
 }
 
 /*
@@ -2325,7 +2324,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
          * 6.   Both rcu_barrier_callback() callbacks are invoked, awakening
          *      us -- but before CPU 1's orphaned callbacks are invoked!!!
          */
-        init_completion(&rcu_barrier_completion);
+        init_completion(&rsp->barrier_completion);
         atomic_set(&rsp->barrier_cpu_count, 1);
         raw_spin_lock_irqsave(&rsp->onofflock, flags);
         rsp->rcu_barrier_in_progress = current;
@@ -2375,10 +2374,10 @@ static void _rcu_barrier(struct rcu_state *rsp)
          * CPU, and thus each counted, remove the initial count.
          */
         if (atomic_dec_and_test(&rsp->barrier_cpu_count))
-                complete(&rcu_barrier_completion);
+                complete(&rsp->barrier_completion);
 
         /* Wait for all rcu_barrier_callback() callbacks to be invoked. */
-        wait_for_completion(&rcu_barrier_completion);
+        wait_for_completion(&rsp->barrier_completion);
 
         /* Other rcu_barrier() invocations can now safely proceed. */
         mutex_unlock(&rcu_barrier_mutex);