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Date: Mon, 2 Feb 2009 23:33:50 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Jesse Barnes <jesse.barnes@...el.com>,
Andreas Schwab <schwab@...e.de>, Len Brown <lenb@...nel.org>
Subject: Re: PCI PM: Restore standard config registers of all devices early
On Monday 02 February 2009, Linus Torvalds wrote:
>
> On Mon, 2 Feb 2009, Rafael J. Wysocki wrote:
> >
> > I think it would be easier to make ACPI allow us to run AML with interrupts
> > off.
>
> Well, I'd agree, except I have this strong memory of us having known bugs
> with ACPI turning hard-interrupts on again. Similarly, it uses mutexes etc
> that simply don't work with interrupts off and/or may turn them on again
> thanks to scheduling.
>
> "Fixing" that seems not very easy. ACPI has a bad habit of being _really_
> hard to fix in this area.
>
> I do agree that _if_ we can just fix ACPI, we wouldn't have these issues,
> and we should just call it with interrupts disabled with our existing
> code. But my previous email was a "maybe we can do it like this" kind of
> thing, which might allow us to use ACPI with none of the irq-off issues.
Well, I think both will be difficult, this way or another. :-)
I'll have a look at the ACPI thing.
Thanks,
Rafael
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