Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

[cascardo/linux.git] / include / linux / lockdep.h

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index d36619e..00e4637 100644 (file)
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -157,6 +157,24 @@ struct lockdep_map {
 #endif
 };
 
+static inline void lockdep_copy_map(struct lockdep_map *to,
+                                   struct lockdep_map *from)
+{
+       int i;
+
+       *to = *from;
+       /*
+        * Since the class cache can be modified concurrently we could observe
+        * half pointers (64bit arch using 32bit copy insns). Therefore clear
+        * the caches and take the performance hit.
+        *
+        * XXX it doesn't work well with lockdep_set_class_and_subclass(), since
+        *     that relies on cache abuse.
+        */
+       for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
+               to->class_cache[i] = NULL;
+}
+
 /*
  * Every lock has a list of other locks that were taken after it.
  * We only grow the list, never remove from it: