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authorDave Jones <davej@redhat.com>2012-03-14 22:17:39 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-04-24 20:54:49 -0700
commit559f9badd11ddf399f88b18b4c0f110fd511ae53 (patch)
tree443f8c575362e19c01c07173c82b0fc3763ebc50 /lib/list_debug.c
parent66f75a5d028beaf67c931435fdc3e7823125730c (diff)
downloadlinux-559f9badd11ddf399f88b18b4c0f110fd511ae53.tar.gz
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>
Diffstat (limited to 'lib/list_debug.c')
-rw-r--r--lib/list_debug.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 982b850d4e7..3810b481f94 100644
--- 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);