linux-kernel - Re: [PATCH 3/3] IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

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Date:	Fri, 06 Oct 2006 07:27:24 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...l.org>,
	Thomas Gleixner <tglx@...utronix.de>, torvalds@...l.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Dmitry Torokhov <dtor@...l.ru>, Greg KH <greg@...ah.com>,
	David Brownell <david-b@...bell.net>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 3/3] IRQ: Maintain regs pointer globally rather than	passing
 to IRQ handlers

Ingo Molnar wrote:
> * Jeff Garzik <jeff@...zik.org> wrote:
> 
>>> NAK to that, it will mess up a lot of older drivers which still use 
>>> the irq field and also those who want it to print
>> Look at the pt_regs change -- the irq change is similar:
>>
>> The information does not go away, it is merely available via another 
>> avenue.
> 
> but pt_regs is alot less frequently used than irq - and where it's used 
> they arent "drivers" but mostly arch level code like hw-timer handlers.

Nonetheless the -vast majority- of drivers don't use the argument at 
all, and the minority that do use it are not modern drivers.

	Jeff



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