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Re: 4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing !WQ_MEM_RECLAIM events:btusb_work

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Hi Tejun,

>> On my Dell XPS 13 9343 (x86_64), the following warning was logged right
>> after a resume from suspend-to-mem (not on *every* resume, though, so it
>> might be hard to reproduce). The kernel is v4.12.0-rc6+ as of 94a6df251dd0,
>> and I don't really use bluetooth, though the drivers are loaded:
>> 
>> PM: Finishing wakeup.
>> OOM killer enabled.
>> Restarting tasks ... done.
>> Bluetooth: hci0: read Intel version: 370710018002030d00
>> Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq
>> Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
>> ... <more, unrelated messages>
>> workqueue: WQ_MEM_RECLAIM hci0:hci_power_off is flushing !WQ_MEM_RECLAIM events:btusb_work
> 
> So, WQ_MEM_RECLAIM has to be transitive; otherwise, it doesn't mean
> anything.  I have a hard time believing that bluetooth actually needs
> WQ_MEM_RECLAIM unless people mount nfs through a bluetooth tethered
> phone.  Would it be possible to remove WQ_MEM_RECLAIM from these
> workqueues?

frankly I do not remember. We used what was recommended to use. I know that the only requirement in one case is that it is a truly single workqueue.

Regards

Marcel

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4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing  !WQ_MEM_RECLAIM events:btusb_work Dominik Brodowski <linux@dominikbrodowski.net> - 2017-06-25 20:30 +0200
  Re: 4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing  !WQ_MEM_RECLAIM events:btusb_work Tejun Heo <tj@kernel.org> - 2017-06-27 17:30 +0200
    Re: 4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing  !WQ_MEM_RECLAIM events:btusb_work Marcel Holtmann <marcel@holtmann.org> - 2017-06-27 19:30 +0200
      Re: 4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing  !WQ_MEM_RECLAIM events:btusb_work Tejun Heo <tj@kernel.org> - 2017-06-27 19:50 +0200
        Re: 4.12.0-rc6+: WQ_MEM_RECLAIM hci0:hci_power_off is flushing  !WQ_MEM_RECLAIM events:btusb_work Dominik Brodowski <linux@dominikbrodowski.net> - 2017-06-28 15:00 +0200
          [PATCH] bluetooth: remove WQ_MEM_RECLAIM from hci workqueues Tejun Heo <tj@kernel.org> - 2017-06-28 20:50 +0200
            Re: [PATCH] bluetooth: remove WQ_MEM_RECLAIM from hci workqueues Marcel Holtmann <marcel@holtmann.org> - 2017-06-29 14:40 +0200

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