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SubjectRe: [PATCH 06/12] workqueue: destroy_worker() can only destory idle worker not just created worker
On Thu, Sep 27, 2012 at 01:20:37AM +0800, Lai Jiangshan wrote:
> After we reimpletment hotplug code, we will not destroy just newly
> created worker, all created worker will enter idle soon.
> And destroy_worker() is not used to destroy just newly created worker,
> it always destory idle worker, so we need to fix destroy_worker()
> and update the comments.
>
> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
> ---
> kernel/workqueue.c | 14 +++++++-------
> 1 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 6c339bf..fe3b1d3 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -1756,8 +1756,7 @@ static struct worker *alloc_worker(void)
> * @pool: pool the new worker will belong to
> *
> * Create a new worker which is bound to @pool. The returned worker
> - * can be started by calling start_worker() or destroyed using
> - * destroy_worker().
> + * can be started by calling start_worker();
> *
> * CONTEXT:
> * Might sleep. Does GFP_KERNEL allocations.
> @@ -1847,7 +1846,7 @@ static void start_worker(struct worker *worker)
> }
>
> /**
> - * destroy_worker - destroy a workqueue worker
> + * destroy_worker - destroy a idle workqueue worker
> * @worker: worker to be destroyed
> *
> * Destroy @worker and adjust @gcwq stats accordingly.
> @@ -1864,11 +1863,12 @@ static void destroy_worker(struct worker *worker)
> /* sanity check frenzy */
> BUG_ON(worker->current_work);
> BUG_ON(!list_empty(&worker->scheduled));
> + BUG_ON(!(worker->flags & WORKER_STARTED));
> + BUG_ON(!(worker->flags & WORKER_IDLE));
> + BUG_ON(list_empty(&worker->entry));

Let's go for WARN_ON() at least for the new ones. Or let's convert
all BUG()s to WARN_ON[_ONCE]() beforehand.

Thanks.

--
tejun


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