From 8b3db9c542e18b71d4820da4dd9401ee030feacb Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 3 Jul 2006 00:24:28 -0700 Subject: [PATCH] [PATCH] lockdep: add DECLARE_COMPLETION_ONSTACK() API lockdep needs to have the waitqueue lock initialized for on-stack waitqueues implicitly initialized by DECLARE_COMPLETION(). Introduce the API. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/completion.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) 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;