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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080110101928.GC28740@does.not.exist>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/