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-rw-r--r--include/linux/completion.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/completion.h b/include/linux/completion.h
index 90663ad217f9..251c41e3ddd5 100644
--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -21,6 +21,18 @@ struct completion {
#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 = ({ init_completion(&work); work; })
+#else
+# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
+#endif
+
static inline void init_completion(struct completion *x)
{
x->done = 0;