linux-kernel - Re: [PATCH x86] [15/16] Force __cpuinit on for CONFIG_PM without HOTPLUG

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Date:	Thu, 10 Jan 2008 12:19:29 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Andi Kleen <ak@...e.de>
Cc:	rjw@...k.pl, pavel@...e.cz, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH x86] [15/16] Force __cpuinit on for CONFIG_PM without
	HOTPLUG_CPU

On Thu, Jan 10, 2008 at 10:58:57AM +0100, Andi Kleen wrote:
> > It seems the correct solution would be not to hijack __cpuinit
> > (as your patch does), but to create a new annotation.
> 
> The rationale is that after suspend the CPU has to be reinitialized.
> That is because it is essentially like a reboot. All the previous
> CPU state is gone.
>...

But your patch does:

+config PM_CPUINIT
+       bool
+       depends on PM
+       default y

As an example, even plain ACPI support without any suspend support in 
the kernel at all requires CONFIG_PM and therefore forces all __cpuinit 
code to be non-__init after your patch.

And if the dependency was corrected to PM_SLEEP it will still make 
the UP kernel use more memory since we currently have __cpuinit code 
that gets discarded after boot but suspend/resume is apparently working.

Plus my other point that it seems to be wrong to do whatever change only 
for x86.

> -Andi

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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