1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/completion.h b/include/linux/completion.h
index 90663ad217f9..268c5a4a2bd4 100644
--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -18,9 +18,24 @@ struct completion {
 #define COMPLETION_INITIALIZER(work) \
         { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
 
+#define COMPLETION_INITIALIZER_ONSTACK(work) \
+        ({ init_completion(&work); work; })
+
 #define DECLARE_COMPLETION(work) \
         struct completion work = COMPLETION_INITIALIZER(work)
 
+/*
+ * Lockdep needs to run a non-constant initializer for on-stack
+ * completions - so we use the _ONSTACK() variant for those that
+ * are on the kernel stack:
+ */
+#ifdef CONFIG_LOCKDEP
+# define DECLARE_COMPLETION_ONSTACK(work) \
+        struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
+#else
+# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
+#endif
+
 static inline void init_completion(struct completion *x)
 {
         x->done = 0;