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rcu: add DEBUG_OBJECTS_RCU_HEAD check for alignment
author
Paul E. McKenney
<paulmck@linux.vnet.ibm.com>
Tue, 29 Mar 2011 19:56:56 +0000
(12:56 -0700)
committer
Paul E. McKenney
<paulmck@linux.vnet.ibm.com>
Fri, 6 May 2011 06:16:57 +0000
(23:16 -0700)
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>
include/linux/rcupdate.h
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diff --git
a/include/linux/rcupdate.h
b/include/linux/rcupdate.h
index
9e169c2
..
c7aeacf
100644
(file)
--- 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,