Preempt-RCU: fix rcu_barrier for preemptive environment.

Fix rcu_barrier() to work properly in preemptive kernel environment.
Also, the ordering of callback must be preserved while moving
callbacks to another CPU during CPU hotplug.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 0 deletions

diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 0ccd0095ebdc..760dfc233a00 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -115,7 +115,17 @@ void rcu_barrier(void)
         mutex_lock(&rcu_barrier_mutex);
         init_completion(&rcu_barrier_completion);
         atomic_set(&rcu_barrier_cpu_count, 0);
+        /*
+         * The queueing of callbacks in all CPUs must be atomic with
+         * respect to RCU, otherwise one CPU may queue a callback,
+         * wait for a grace period, decrement barrier count and call
+         * complete(), while other CPUs have not yet queued anything.
+         * So, we need to make sure that grace periods cannot complete
+         * until all the callbacks are queued.
+         */
+        rcu_read_lock();
         on_each_cpu(rcu_barrier_func, NULL, 0, 1);
+        rcu_read_unlock();
         wait_for_completion(&rcu_barrier_completion);
         mutex_unlock(&rcu_barrier_mutex);
 }