[PATCH v2 tip/core/rcu 29/39] srcu: Fix bogus try_check_zero() comment

[Paul E. McKenney]

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
 kernel/rcu/srcu.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c
index d51ab050f777..5aeeaecfb673 100644
--- a/kernel/rcu/srcu.c
+++ b/kernel/rcu/srcu.c
@@ -254,10 +254,9 @@ static void srcu_gp_start(struct srcu_struct *sp)
 }
 
 /*
- * @@@ Wait until all pre-existing readers complete.  Such readers
- * will have used the index specified by "idx".
- * the caller should ensures the ->completed is not changed while checking
- * and idx = (->completed & 1) ^ 1
+ * Wait until all readers counted by array index idx complete, but loop
+ * a maximum of trycount times.  The caller must ensure that ->completed
+ * is not changed while checking.
  */
 static bool try_check_zero(struct srcu_struct *sp, int idx, int trycount)
 {
-- 
2.5.2