linux-kernel - Re: [RFC][PATCH 0/2] Rework disabling of interrupts during suspend-resume

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Date:	Mon, 23 Feb 2009 09:56:25 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 0/2] Rework disabling of interrupts during
 suspend-resume

On Sun, 2009-02-22 at 14:37 -0800, Eric W. Biederman wrote:
> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> 
> > Moreover, the real purpose of these changes is to be able to execute the
> > "late" suspend and "early" resume device callbacks with timer interrupts
> > enabled, so that they can use mutexes etc.  However, x86 currently doesn't set
> > the IRQF_TIMER flag and I need to make it do so before going further in this
> > direction and changing the PCI PM framework to take advantage of the $subject
> > changes, for example.  So, I need to know how to modify x86 timer code so that
> > the IRQF_TIMER flag is set by it.
> 
> How does this sync with the ACPI requirement that the it's late suspend MUST
> happen with irqs disabled?

If I understand properly what the intention here is, the sysdev suspend
and later still happens with hard irqs off.

This is purely the layer between suspend and suspend_late at the driver
level that uses the above instead of hard IRQs off in order to be able
to properly order the ACPI calls vs. the driver calls.

Ben.


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