linux-kernel - Re: [RFC PATCH 3/3] genericirq: change ack/mask in irq_chip to take irq

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Date:	Thu, 18 Feb 2010 09:13:54 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC PATCH 3/3] genericirq: change ack/mask in irq_chip to take
 irq_desc in addition to irq

On 02/18/2010 09:04 AM, Eric W. Biederman wrote:
> 
> May I ask why these methods and why pass both irq and desc instead of
> just desc?
> 
> I think in the long run passing both irq and desc through several
> functions may incur some maintenance cost that it would be nice not to
> pay (register pressure and increased chance of typos).
> 

Indeed; if the IRQ number is needed the function should just get it from
desc->irq.

	-hpa
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