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Re: [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from Kconfig

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On Thu, 28 Sep 2017, Peter Zijlstra wrote:

> On Wed, Sep 27, 2017 at 02:42:20PM -0700, Govindarajulu Varadarajan wrote:
>> Make MAX_LOCK_DEPTH configurable. It is set to 48 right now. Number of
>> VFs under a PCI pf bus can exceed 48 and this disables lockdep.
>>
>> lockdep currently allows max of 63 held_locks.
>
> But why a config knob? Why not just raise the number to 64
> unconditionally? And is that sufficient; you only state 48 is
> insufficient, you don't actually state the VF limit.
>

I did not want to change the default configuration for everyone.

I will change it 63 unconditionally in v2 and resubmit the series.

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[PATCH 0/4] pci aer: fix deadlock in do_recovery Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-28 00:00 +0200
  [PATCH 1/4] pci: introduce __pci_walk_bus for caller with pci_bus_sem held Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-28 00:00 +0200
    Re: [PATCH 1/4] pci: introduce __pci_walk_bus for caller with  pci_bus_sem held Sinan Kaya <okaya@codeaurora.org> - 2017-09-28 18:20 +0200
      Re: [PATCH 1/4] pci: introduce __pci_walk_bus for caller with  pci_bus_sem held Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-29 02:00 +0200
  [PATCH 3/4] pci aer: fix deadlock in do_recovery Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-28 00:00 +0200
    Re: [PATCH 3/4] pci aer: fix deadlock in do_recovery Sinan Kaya <okaya@codeaurora.org> - 2017-09-28 18:50 +0200
      Re: [PATCH 3/4] pci aer: fix deadlock in do_recovery Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-29 01:50 +0200
        Re: [PATCH 3/4] pci aer: fix deadlock in do_recovery Sinan Kaya <okaya@codeaurora.org> - 2017-09-29 15:40 +0200
          Re: [PATCH 3/4] pci aer: fix deadlock in do_recovery Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-30 08:10 +0200
  [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from Kconfig Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-28 00:00 +0200
    Re: [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from  Kconfig Peter Zijlstra <peterz@infradead.org> - 2017-09-28 11:30 +0200
      Re: [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from  Kconfig Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-29 02:00 +0200
        Re: [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from  Kconfig Bjorn Helgaas <helgaas@kernel.org> - 2017-09-29 18:30 +0200
          Re: [PATCH 4/4] lockdep: make MAX_LOCK_DEPTH configurable from  Kconfig Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-30 08:10 +0200
  [PATCH 2/4] pci: code refactor pci_bus_lock/unlock/trylock Govindarajulu Varadarajan <gvaradar@cisco.com> - 2017-09-28 00:00 +0200

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