Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

Pull RCU changes from Paul E. McKenney:

- Convert RCU's BUG_ON() and similar calls to WARN_ON() and similar.

- Replace calls of RCU-bh and RCU-sched update-side functions
  to their vanilla RCU counterparts.  This series is a step
  towards complete removal of the RCU-bh and RCU-sched update-side
  functions.

  ( Note that some of these conversions are going upstream via their
    respective maintainers. )

- Documentation updates, including a number of flavor-consolidation
  updates from Joel Fernandes.

- Miscellaneous fixes.

- Automate generation of the initrd filesystem used for
  rcutorture testing.

- Convert spin_is_locked() assertions to instead use lockdep.

  ( Note that some of these conversions are going upstream via their
    respective maintainers. )

- SRCU updates, especially including a fix from Dennis Krein
  for a bag-on-head-class bug.

- RCU torture-test updates.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 12 insertions, 13 deletions

diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c
index 3f943efcf61c..be10036fa621 100644
--- a/kernel/rcu/sync.c
+++ b/kernel/rcu/sync.c
@@ -44,15 +44,15 @@ static const struct {
 		__INIT_HELD(rcu_read_lock_held)
 	},
 	[RCU_SCHED_SYNC] = {
-		.sync = synchronize_sched,
-		.call = call_rcu_sched,
-		.wait = rcu_barrier_sched,
+		.sync = synchronize_rcu,
+		.call = call_rcu,
+		.wait = rcu_barrier,
 		__INIT_HELD(rcu_read_lock_sched_held)
 	},
 	[RCU_BH_SYNC] = {
-		.sync = synchronize_rcu_bh,
-		.call = call_rcu_bh,
-		.wait = rcu_barrier_bh,
+		.sync = synchronize_rcu,
+		.call = call_rcu,
+		.wait = rcu_barrier,
 		__INIT_HELD(rcu_read_lock_bh_held)
 	},
 };
@@ -125,8 +125,7 @@ void rcu_sync_enter(struct rcu_sync *rsp)
 		rsp->gp_state = GP_PENDING;
 	spin_unlock_irq(&rsp->rss_lock);
 
-	BUG_ON(need_wait && need_sync);
-
+	WARN_ON_ONCE(need_wait && need_sync);
 	if (need_sync) {
 		gp_ops[rsp->gp_type].sync();
 		rsp->gp_state = GP_PASSED;
@@ -139,7 +138,7 @@ void rcu_sync_enter(struct rcu_sync *rsp)
 		 * Nobody has yet been allowed the 'fast' path and thus we can
 		 * avoid doing any sync(). The callback will get 'dropped'.
 		 */
-		BUG_ON(rsp->gp_state != GP_PASSED);
+		WARN_ON_ONCE(rsp->gp_state != GP_PASSED);
 	}
 }
 
@@ -166,8 +165,8 @@ static void rcu_sync_func(struct rcu_head *rhp)
 	struct rcu_sync *rsp = container_of(rhp, struct rcu_sync, cb_head);
 	unsigned long flags;
 
-	BUG_ON(rsp->gp_state != GP_PASSED);
-	BUG_ON(rsp->cb_state == CB_IDLE);
+	WARN_ON_ONCE(rsp->gp_state != GP_PASSED);
+	WARN_ON_ONCE(rsp->cb_state == CB_IDLE);
 
 	spin_lock_irqsave(&rsp->rss_lock, flags);
 	if (rsp->gp_count) {
@@ -225,7 +224,7 @@ void rcu_sync_dtor(struct rcu_sync *rsp)
 {
 	int cb_state;
 
-	BUG_ON(rsp->gp_count);
+	WARN_ON_ONCE(rsp->gp_count);
 
 	spin_lock_irq(&rsp->rss_lock);
 	if (rsp->cb_state == CB_REPLAY)
@@ -235,6 +234,6 @@ void rcu_sync_dtor(struct rcu_sync *rsp)
 
 	if (cb_state != CB_IDLE) {
 		gp_ops[rsp->gp_type].wait();
-		BUG_ON(rsp->cb_state != CB_IDLE);
+		WARN_ON_ONCE(rsp->cb_state != CB_IDLE);
 	}
 }