rcu: Rename ->onofflock to ->orphan_lock

The ->onofflock field in the rcu_state structure at one time synchronized
CPU-hotplug operations for RCU.  However, its scope has decreased over time
so that it now only protects the lists of orphaned RCU callbacks.  This
commit therefore renames it to ->orphan_lock to reflect its current use.

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, 4 deletions

diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index a240f032848e..a7c945d149cf 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -383,9 +383,8 @@ struct rcu_state {
 
         /* End of fields guarded by root rcu_node's lock. */
 
-        raw_spinlock_t onofflock ____cacheline_internodealigned_in_smp;
-                                                /* exclude on/offline and */
-                                                /*  starting new GP. */
+        raw_spinlock_t orphan_lock ____cacheline_internodealigned_in_smp;
+                                                /* Protect following fields. */
         struct rcu_head *orphan_nxtlist;        /* Orphaned callbacks that */
                                                 /*  need a grace period. */
         struct rcu_head **orphan_nxttail;       /* Tail of above. */
@@ -394,7 +393,7 @@ struct rcu_state {
         struct rcu_head **orphan_donetail;      /* Tail of above. */
         long qlen_lazy;                         /* Number of lazy callbacks. */
         long qlen;                              /* Total number of callbacks. */
-        /* End of fields guarded by onofflock. */
+        /* End of fields guarded by orphan_lock. */
 
         struct mutex onoff_mutex;               /* Coordinate hotplug & GPs. */