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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-22 17:36:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-22 17:36:56 -0700
commitc54894cd4672d513e43e0d17d7b0387bf6b2c2c4 (patch)
tree85a540716d82570f98a92b85c66ea5875f983f46 /include
parentfb09bafda67041b74a668dc9d77735e36bd33d3b (diff)
parent4d82a1debbffec129cc387aafa8f40b7bbab3297 (diff)
Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue changes from Tejun Heo: "Nothing exciting. Most are updates to debug stuff and related fixes. Two not-too-critical bugs are fixed - WARN_ON() triggering spurious during cpu offlining and unlikely lockdep related oops." * 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: lockdep: fix oops in processing workqueue workqueue: skip nr_running sanity check in worker_enter_idle() if trustee is active workqueue: Catch more locking problems with flush_work() workqueue: change BUG_ON() to WARN_ON() trace: Remove unused workqueue tracer
Diffstat (limited to 'include')
-rw-r--r--include/linux/lockdep.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index d36619ead3b..00e46376e28 100644
--- 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: