On Fri, Jan 29, 2016 at 05:59:46AM -0500, Tejun Heo wrote:
> fca839c00a12 ("workqueue: warn if memory reclaim tries to flush
> !WQ_MEM_RECLAIM workqueue") implemented flush dependency warning which
> triggers if a PF_MEMALLOC task or WQ_MEM_RECLAIM workqueue tries to
> flush a !WQ_MEM_RECLAIM workquee.
>
> This assumes that workqueues marked with WQ_MEM_RECLAIM sit in memory
> reclaim path and making it depend on something which may need more
> memory to make forward progress can lead to deadlocks. Unfortunately,
> workqueues created with the legacy create*_workqueue() interface
> always have WQ_MEM_RECLAIM regardless of whether they are depended
> upon memory reclaim or not. These spurious WQ_MEM_RECLAIM markings
> cause spurious triggering of the flush dependency checks.
...
Applied to wq/for-4.5-fixes.
Thanks.
--
tejun
