linux-kernel - Re: [linux-pm] Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

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Message-ID: <87d4wb680u.fsf@jbms.ath.cx>
Date:	Fri, 21 Sep 2007 17:08:49 -0400
From:	Jeremy Maitin-Shepard <jbms@....edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	nigel@...pend2.net, Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang\, Ying" <ying.huang@...el.com>,
	linux-pm@...ts.linux-foundation.org,
	huang ying <huang.ying.caritas@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Friday, 21 September 2007 22:26, Jeremy Maitin-Shepard wrote:
>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
>> 
>> [snip]
>> 
>> > The ACPI NVS area is explicitly marked as reserved and we don't save it.
>> > On x86_64 we don't save any memory areas marked as reserved and yet the
> above
>> > happens.
>> 
>> I think you have mentioned before, though, that ACPI is first
>> initialized by the boot kernel, before it is later initialized by
>> resuming kernel.  This could well be the source of the problem.

> No, it's not.  I have tested that too with an ACPI-less boot kernel.

Well, it seems that there just must be some other bug.  I would define
anything that differs between the post-resume initialization of ACPI from
the normal boot initialization of ACPI as a bug.  If the interaction
with the hardware is the same, then the behavior will be the same.

-- 
Jeremy Maitin-Shepard
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