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

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Message-Id: <200708032345.32262.lenb@kernel.org>
Date:	Fri, 3 Aug 2007 23:45:31 -0400
From:	Len Brown <lenb@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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:
> > >  	depends on PM
> > > -	depends on !SMP || SUSPEND_SMP_POSSIBLE
> > > +	depends on SUSPEND_SMP_POSSIBLE || ((BLACKFIN || MIPS || SUPERH || FRV \
> > > +		    || (PPC32 && PPC_MPC52xx)) && !SMP)
> > 
> > Please, do that as SUSPEND_UP_POSSIBLE, and make it look like
> > 
> > 	config SUSPEND_UP_POSSIBLE
> > 		depends on BLACKFIN || MIPS || SUPERH || FRV || ((PPC32 && PPC_MPC52xx)
> > 		depends on !SMP
> > 		default y
> 
> OK
> 
> > and now you can write the above thing as
> > 
> > 	depends on SUSPEND_SMP_POSSIBLE || SUSPEND_UP_POSSIBLE
> > 
> > and it's all much nicer.
> > 
> > I would say that doing a similar setup for HIBERNATE would be nice too,
> > but the SUSPEND case is more noticeable because the SMP case is so nice 
> > already.
> 
> I did it symmetrically for suspend and hibernation and renamed SUSPEND_SMP to
> PM_SLEEP_SMP.  Patch follows.
> 
> 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 |   40 ++++++++++++++++++++++++++++++----------
>  1 file changed, 30 insertions(+), 10 deletions(-)
> 
> Index: linux-2.6/kernel/power/Kconfig
> ===================================================================
> --- linux-2.6.orig/kernel/power/Kconfig	2007-07-30 07:58:48.000000000 +0200
> +++ linux-2.6/kernel/power/Kconfig	2007-08-04 00:39:21.000000000 +0200
> @@ -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 +84,45 @@ config PM_SLEEP
>  	depends on SUSPEND || HIBERNATION
>  	default y
>  
> +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.

thanks,
-Len
-
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