rcu: List-debug variants of rcu list routines.
* Make __list_add_rcu check the next->prev and prev->next pointers
just like __list_add does.
* Make list_del_rcu use __list_del_entry, which does the same checking
at deletion time.
Has been running for a week here without anything being tripped up,
but it seems worth adding for completeness just in case something
ever does corrupt those lists.
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index d079290..a20c050 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -30,6 +30,7 @@
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
+#ifndef CONFIG_DEBUG_LIST
static inline void __list_add_rcu(struct list_head *new,
struct list_head *prev, struct list_head *next)
{
@@ -38,6 +39,10 @@
rcu_assign_pointer(list_next_rcu(prev), new);
next->prev = new;
}
+#else
+extern void __list_add_rcu(struct list_head *new,
+ struct list_head *prev, struct list_head *next);
+#endif
/**
* list_add_rcu - add a new entry to rcu-protected list
@@ -108,7 +113,7 @@
*/
static inline void list_del_rcu(struct list_head *entry)
{
- __list_del(entry->prev, entry->next);
+ __list_del_entry(entry);
entry->prev = LIST_POISON2;
}