linux-kernel - Re: [Resend][PATCH 1/9] ACPI: Implement the set_target() callback from pm

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Date:	Wed, 18 Jul 2007 08:41:10 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-acpi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <david-b@...bell.net>,
	Len Brown <len.brown@...el.com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>, Shaohua Li <shaohua.li@...el.com>,
	Johannes Berg <johannes@...solutions.net>,
	Paul Mackerras <paulus@...ba.org>,
	Russell King <rmk@....linux.org.uk>
Subject: Re: [Resend][PATCH 1/9] ACPI: Implement the set_target() callback from pm_ops

On Wednesday, 18 July 2007 02:02, Andrew Morton wrote:
> On Tue, 17 Jul 2007 22:40:06 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > In the future some drivers may need to use ACPI to determine the low power
> > states in which to place their devices, but to provide the drivers with this
> > information the ACPI core needs to know what sleep state the system is going to
> > enter.  Namely, the device's state should not be too high power for given system
> > sleep state and, if the device is supposed to be able to wake up the system, its
> > state should not be too low power for the wake up to be possible).  For this
> > purpose, the ACPI core needs to implement the set_target() method in 'struct
> > pm_ops' and store the target system sleep state passed by the PM core in a
> > variable.
> > 
> 
> Len, I can add this to the to-send-to-Len queue, but it would be more
> convenient at this end if you were to ack it and I'll send it in. 
> Preferences?
> 
> 
> > 
> > Index: linux-2.6.22-git5/drivers/acpi/sleep/main.c
> > ===================================================================
> > --- linux-2.6.22-git5.orig/drivers/acpi/sleep/main.c
> > +++ linux-2.6.22-git5/drivers/acpi/sleep/main.c
> > @@ -34,34 +34,54 @@ static u32 acpi_suspend_states[] = {
> >  
> >  static int init_8259A_after_S1;
> >  
> > +extern int acpi_sleep_prepare(u32 acpi_state);
> > +extern void acpi_power_off(void);
> 
> weep.  Please don't do this.

Well, in fact I didn't add those.  They were just moved from below the comment
before acpi_pm_prepare().  Seems logical to me ...

> checkpatch will detect this error.

Well, I'd call it a false positive. :-)
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