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

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Message-ID: <1516181177.3280.13.camel@hxt-semitech.com>
Date:   Wed, 17 Jan 2018 09:26:24 +0000
From:   "Yang, Shunyong" <shunyong.yang@...-semitech.com>
To:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "marc.zyngier@....com" <marc.zyngier@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irqdomain: provide useful debugging information for irq
 domain

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.
The nodes under debugfs irq/domains describes the hierarchy of each irq
domain.
The nodes under debugfs irq/irqs describes information of every single
irq.

Thanks
Shunyong