linux-kernel - Re: [patch 01/16] irqdomain: Introduce new interfaces to support hierarchy irqdomains

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Date:	Mon, 24 Nov 2014 15:32:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 01/16] irqdomain: Introduce new interfaces to support
 hierarchy irqdomains

On Mon, 24 Nov 2014, Yun Wu (Abel) wrote:
> On 2014/11/24 21:13, Thomas Gleixner wrote:
> > In the hierarchical case we do not touch the hardware in the
> > allocation step, so we need to activate the allocated interrupt in the
> > hardware before we can use it. And that's clearly a domain interface
> > not a irq chip issue.
> > 
> 
> Makes sense, now the interrupt domain seems to be the best place.
> And when the @domain parameter can be really useful? I haven't see
> anyone using it so far.

All irqdomain callbacks take the domain pointer as their first
parameter. So for consistency sake we made it that way.

You can argue in circles about whether the domain argument could be
removed. It's going to stay for now as it does not matter at all.

Thanks,

	tglx
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