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Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs

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On Mon, Aug 21, 2017 at 03:49:50PM +0200, Laurent Vivier wrote:
> In wq_numa_init() a list of NUMA nodes with their list of possible CPUs
> is built.
> 
> Unfortunately, on powerpc, the Firmware is only able to provide the
> node of a CPU if the CPU is present. So, in our case (possible CPU)
> CPU ids are known, but as the CPU is not present, the node id is
> unknown and all the unplugged CPUs are attached to node 0.

This is something powerpc needs to fix.  Workqueue isn't the only one
making this assumption.  mm as a whole assumes that CPU <-> node
mapping is stable regardless of hotplug events.  Powerpc people know
about the issue and AFAIK are working on it.

Thanks.

-- 
tejun

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[PATCH 1/2] powerpc/workqueue: update list of possible CPUs Laurent Vivier <lvivier@redhat.com> - 2017-08-21 16:00 +0200
  Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Tejun Heo <tj@kernel.org> - 2017-08-21 16:50 +0200
    Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Michael Ellerman <mpe@ellerman.id.au> - 2017-08-22 03:50 +0200
      Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Tejun Heo <tj@kernel.org> - 2017-08-22 19:00 +0200
        Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Michael Ellerman <mpe@ellerman.id.au> - 2017-08-23 13:10 +0200
          Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Laurent Vivier <lvivier@redhat.com> - 2017-08-23 13:20 +0200
          Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Tejun Heo <tj@kernel.org> - 2017-08-23 15:30 +0200
            Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Laurent Vivier <lvivier@redhat.com> - 2017-08-24 14:20 +0200
              Re: [PATCH 1/2] powerpc/workqueue: update list of possible CPUs Tejun Heo <tj@kernel.org> - 2017-08-24 16:00 +0200

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