rcu: List-debug variants of rcu list routines.

[cascardo/linux.git] / lib / list_debug.c

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 982b850..3810b48 100644 (file)
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -10,6 +10,7 @@
 #include <linux/list.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
+#include <linux/rculist.h>
 
 /*
  * Insert a new entry between two known consecutive entries.
@@ -75,3 +76,24 @@ void list_del(struct list_head *entry)
        entry->prev = LIST_POISON2;
 }
 EXPORT_SYMBOL(list_del);
+
+/*
+ * RCU variants.
+ */
+void __list_add_rcu(struct list_head *new,
+                   struct list_head *prev, struct list_head *next)
+{
+       WARN(next->prev != prev,
+               "list_add_rcu corruption. next->prev should be "
+               "prev (%p), but was %p. (next=%p).\n",
+               prev, next->prev, next);
+       WARN(prev->next != next,
+               "list_add_rcu corruption. prev->next should be "
+               "next (%p), but was %p. (prev=%p).\n",
+               next, prev->next, prev);
+       new->next = next;
+       new->prev = prev;
+       rcu_assign_pointer(list_next_rcu(prev), new);
+       next->prev = new;
+}
+EXPORT_SYMBOL(__list_add_rcu);