rcu: add DEBUG_OBJECTS_RCU_HEAD check for alignment

Verify that rcu_head structures are aligned to a four-byte boundary.
This check is enabled by CONFIG_DEBUG_OBJECTS_RCU_HEAD.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 9e169c2ba91f..c7aeacf7fc98 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -785,6 +785,7 @@ extern struct debug_obj_descr rcuhead_debug_descr;
 
 static inline void debug_rcu_head_queue(struct rcu_head *head)
 {
+        WARN_ON_ONCE((unsigned long)head & 0x3);
         debug_object_activate(head, &rcuhead_debug_descr);
         debug_object_active_state(head, &rcuhead_debug_descr,
                                   STATE_RCU_HEAD_READY,