linux-kernel - Re: [2.6 patch] let SUSPEND select HOTPLUG

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Date:	Sat, 28 Jul 2007 01:03:07 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	david@...g.hm, Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>
Subject: Re: [2.6 patch] let SUSPEND select HOTPLUG_CPU

On Sat, Jul 28, 2007 at 12:47:37AM +0200, Stefan Richter wrote:
> Adrian Bunk wrote:
> > The dependency of SUSPEND_SMP on HOTPLUG_CPU is quite unintuitive,
> 
> It's not entirely unintuitive.  That option's full name is "Support for
> suspend on SMP and hot-pluggable CPUs".
> 
> Only the place where you find the option is unintuitive, as far as its
> first application is concerned.  (It lives in the "Processor type and
> features" menu which is OK for the 2nd application of this option.)  And
> the variable name of that option is unintuitive because it covers only
> the 2nd application of the option, I suppose for historical reasons.

We can figure out ourselves when HOTPLUG_CPU is required, so there's no 
reason to bother the user with it.

> > +config SUSPEND_SMP_POSSIBLE
> > +	bool
> > +	depends on (X86 && !X86_VOYAGER) || (PPC64 && (PPC_PSERIES || PPC_PMAC))
> > +	depends on SMP
> > +	default y
> > +
> > +config SUSPEND_SMP
> > +	bool
> > +	depends on SUSPEND_SMP_POSSIBLE && SOFTWARE_SUSPEND
> > +	select HOTPLUG_CPU
> > +	default y
> 
> Yes, that's the price to pay if you want to select something that in
> turn depends on a number of other things.

Yes, but a good user interface is worth it.

> Wait, doesn't HOTPLUG_CPU also depend on EXPERIMENTAL?

Damn, I started thinking about it, and then forgot about it when 
finishing the patch.

My thoughts were:
Is HOTPLUG_CPU still an experimental feature, or has it become a 
well-tested no longer experimental feature now that it's used on
most recent laptops?

> Stefan Richter

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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