Re: [PATCH] irqdomain: provide useful debugging information for irq domain

[Thomas Gleixner]

On Wed, 17 Jan 2018, Yang, Shunyong wrote:

> Hi, Marc and Thomas,
> 
> Thanks for your feedback.
> 
> On Wed, 2018-01-17 at 10:18 +0100, Thomas Gleixner wrote:
> > On Wed, 17 Jan 2018, Marc Zyngier wrote:
> > > 
> > > In all honesty, I'd be more inclined to remove this debug feature
> > > altogether, as CONFIG_GENERIC_IRQ_DEBUGFS is more complete and more
> > > useful. Is there any feature missing from that infrastructure that
> > > prevents you from using it instead?
> > > 
> > > If the answer is "none", then I'll post a patch removing it.
> > Wanted to do that quite some time ago and never came around to it.
> 
> I think they have different purpose.
> irq_domain_mapping is an overiew of the mapping of each virq to hwirq
> and the domain it belongs. It likes a map or index of each IRQs. I tend
> to suggest to keep it.

And how is that different from:

> The nodes under debugfs irq/irqs describes information of every single
> irq.

Not at all. It contains the complete hierarchical information of each virq.

Thanks,

	tglx