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

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Date:	Mon, 2 Oct 2006 16:43:38 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Andrew Morton" <akpm@...l.org>
Cc:	"David Howells" <dhowells@...hat.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, torvalds@...l.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"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

On 10/2/06, Andrew Morton <akpm@...l.org> wrote:
> On Mon, 02 Oct 2006 17:21:09 +0100
> David Howells <dhowells@...hat.com> wrote:
>
> > Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
> > of passing regs around manually through all ~1800 interrupt handlers in the
> > Linux kernel.
> >

Nice! I was wanting to do that for a long time...

>
> I think the change is good.  But I don't want to maintain this whopper
> out-of-tree for two months!  If we want to do this, we should just smash it
> in and grit our teeth.

Yes, lets drop it in while we still not reached rc1.

>
> > Some notes on the interrupt handling in the drivers:
> >
> >  (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
> >      the input_dev struct.

Good riddance... Athough I would not remove input_regs() just yet but
just redefine it to an empty inline and mark it as depreciated so we
won't break all out-of-tree input drivers right away. Removal of
input_regs() from in-tree drivers could be done by separate patch as
well, once main changes are in.

-- 
Dmitry
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