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>
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 5929b02..ca7d167 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -158,7 +158,6 @@
/* 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 @@
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 @@
* 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 @@
* 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);