linux-kernel - Re: [PATCH] PM: Fix dependencies of CONFIG_SUSPEND and CONFIG

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Message-Id: <200708050009.10769.rjw@sisk.pl>
Date:	Sun, 5 Aug 2007 00:09:09 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: [PATCH] PM: Fix dependencies of CONFIG_SUSPEND and CONFIG_HIBERNATION

On Saturday, 4 August 2007 11:48, Rafael J. Wysocki wrote:
> On Saturday, 4 August 2007 05:45, Len Brown wrote:
> > On Friday 03 August 2007 18:47, Rafael J. Wysocki wrote:
> > > On Saturday, 4 August 2007 00:01, Linus Torvalds wrote:
> > > > On Fri, 3 Aug 2007, Rafael J. Wysocki wrote:
> [--snip--]
> > >  
> > > +config SUSPEND_UP_POSSIBLE
> > > +	bool
> > > +	depends on BLACKFIN || MIPS || SUPERH || FRV || (PPC32 && PPC_MPC52xx)
> > 
> > please include (X86 && !X86_VOYAGER) here -- else you'll disable
> > SUSPEND from all X86 when built UP.
> 
> Right.  I think I should include everything that can do SMP suspend here.
> 
> Updated patch is appended.

Well, unfortunately, the patch below is buggy, because I need to change
CONFIG_SUSPEND_SMP into CONFIG_PM_SLEEP_SMP in some more places.

I'll send an updated version in a new thread.

Greetings,
Rafael


> ---
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Dependencies of CONFIG_SUSPEND and CONFIG_HIBERNATION introduced by commit
> 296699de6bdc717189a331ab6bbe90e05c94db06 "Introduce CONFIG_SUSPEND for
> suspend-to-Ram and standby" are incorrect, as they don't cover the facts that
> (1) not all architectures support suspend and (2) SMP hibernation is only
> possible on X86 and PPC64 (if PPC64_SWSUSP is set).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  kernel/power/Kconfig |   42 ++++++++++++++++++++++++++++++++----------
>  1 file changed, 32 insertions(+), 10 deletions(-)
> 
> Index: linux-2.6/kernel/power/Kconfig
> ===================================================================
> --- linux-2.6.orig/kernel/power/Kconfig
> +++ linux-2.6/kernel/power/Kconfig
> @@ -72,15 +72,10 @@ config PM_TRACE
>  	CAUTION: this option will cause your machine's real-time clock to be
>  	set to an invalid time after a resume.
>  
> -config SUSPEND_SMP_POSSIBLE
> -	bool
> -	depends on (X86 && !X86_VOYAGER) || (PPC64 && (PPC_PSERIES || PPC_PMAC))
> -	depends on SMP
> -	default y
> -
> -config SUSPEND_SMP
> +config PM_SLEEP_SMP
>  	bool
> -	depends on SUSPEND_SMP_POSSIBLE && PM_SLEEP
> +	depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
> +	depends on PM_SLEEP
>  	select HOTPLUG_CPU
>  	default y
>  
> @@ -89,20 +84,47 @@ config PM_SLEEP
>  	depends on SUSPEND || HIBERNATION
>  	default y
>  
> +config SUSPEND_UP_POSSIBLE
> +	bool
> +	depends on (X86 && !X86_VOYAGER) || (PPC32 && PPC_MPC52xx) \
> +		   || (PPC64 && (PPC_PSERIES || PPC_PMAC)) || ARM || BLACKFIN \
> +		   || MIPS || SUPERH || FRV
> +	depends on !SMP
> +	default y
> +
> +config SUSPEND_SMP_POSSIBLE
> +	bool
> +	depends on (X86 && !X86_VOYAGER) \
> +		   || (PPC64 && (PPC_PSERIES || PPC_PMAC)) || ARM
> +	depends on SMP
> +	default y
> +
>  config SUSPEND
>  	bool "Suspend to RAM and standby"
>  	depends on PM
> -	depends on !SMP || SUSPEND_SMP_POSSIBLE
> +	depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_POSSIBLE
>  	default y
>  	---help---
>  	  Allow the system to enter sleep states in which main memory is
>  	  powered and thus its contents are preserved, such as the
>  	  suspend-to-RAM state (i.e. the ACPI S3 state).
>  
> +config HIBERNATION_UP_POSSIBLE
> +	bool
> +	depends on X86 || PPC64_SWSUSP || FRV || PPC32
> +	depends on !SMP
> +	default y
> +
> +config HIBERNATION_SMP_POSSIBLE
> +	bool
> +	depends on (X86 && !X86_VOYAGER) || PPC64_SWSUSP
> +	depends on SMP
> +	default y
> +
>  config HIBERNATION
>  	bool "Hibernation (aka 'suspend to disk')"
>  	depends on PM && SWAP
> -	depends on ((X86 || PPC64_SWSUSP || FRV || PPC32) && !SMP) || SUSPEND_SMP_POSSIBLE
> +	depends on HIBERNATION_UP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
>  	---help---
>  	  Enable the suspend to disk (STD) functionality, which is usually
>  	  called "hibernation" in user interfaces.  STD checkpoints the
> -
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> 

-- 
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