linux-kernel - Re: [patch 0/2] suspend/resume regression fixes

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Date:	Fri, 28 Sep 2007 17:17:55 -0400
From:	Mark Lord <lkml@....ca>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [patch 0/2] suspend/resume regression fixes

Thomas Gleixner wrote:
> On Fri, 2007-09-28 at 16:27 -0400, Mark Lord wrote:
..
>> On a closely related note:  I just now submitted a patch to fix SMP-poweroff,
>> by having it do disable_nonboot_cpus before doing poweroff.
>>
>> Which has led me to thinking..
>> ..are similar precautions perhaps necessary for *all* ACPI BIOS calls?
>>
>> Because one never knows what the other CPUs are doing at the same time,
>> and what the side effects may be on the ACPI BIOS functions.
>>
>> And also, I wonder if at a minimum we should be guaranteeing ACPI BIOS calls
>> only ever happen from CPU#0 (or the "boot" CPU)?   Or do we do that already?
> 
> The ACPI calls are serialized in the kernel, AFAICT. But the fragile
> situations (suspend, resume, shutdown, reboot) are probably those, where
> some BIOS implementation expect that certain things are not called or
> not active.

Mmm.. *do* we actually do this for reboot?  I don't see it there.
And how about for kexec?

I'm probably just missing seeing it.  Right?

Cheers
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