[PATCH tip/core/rcu 03/13] types: Update obsolete callback_head comment

[Paul E. McKenney]

The comment header for callback_head (and thus for rcu_head) states that
the bottom two bits of a pointer to these structures must be zero.  This
is obsolete:  The new requirement is that only the bottom bit need be
zero.  This commit therefore updates this comment.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
 include/linux/types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/types.h b/include/linux/types.h
index 1e7bd24848fc..258099a4ed82 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -209,7 +209,7 @@ struct ustat {
  * naturally due ABI requirements, but some architectures (like CRIS) have
  * weird ABI and we need to ask it explicitly.
  *
- * The alignment is required to guarantee that bits 0 and 1 of @next will be
+ * The alignment is required to guarantee that bit 0 of @next will be
  * clear under normal conditions -- as long as we use call_rcu(),
  * call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback.
  *
-- 
2.5.2