Can we apply https://lkml.kernel.org/r/d1f760f9-cdb2-f40d-33d8-bfa517c731be@xxxxxxxxxxxxxxxxxxx ? On 2021/12/03 20:01, Tetsuo Handa wrote: > On 2021/12/03 15:50, Christoph Hellwig wrote: >> task_work_add sounds nice, but it is currently not exported which might >> be for a reason (I don't really have any experience with it). > > I didn't find a reason not to export. But generally task_work_add() users > seem to implement a fallback which uses a WQ in case task_work_add() failed > (i.e. exit_task_work() was already called from do_exit()) or task_work_add() > cannot be used (e.g. the caller is a kernel thread). > > I don't know if there is possibility that a kernel thread calls blkdev_put(), > but implementing the fallback path after all requires WQ. Thus, I think that > starting from WQ only and see if something breaks is fine. >
