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

[Govindarajulu Varadarajan]

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.