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

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Message-Id: <200710242238.02978.rjw@sisk.pl>
Date:	Wed, 24 Oct 2007 22:38:02 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Nigel Cunningham <nigel@...el.suspend2.net>,
	Kyle Moffett <mrmacman_g4@....com>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Alan Stern <stern@...land.harvard.edu>, 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

On Thursday, 11 October 2007 22:54, Pavel Machek wrote:
> Hi!
> 
> > > That's certainly possible. We already pass a very small amount of data between 
> > > the boot and resuming kernels at the moment, and it's done quite simply - by 
> > > putting the variables we want to 'transfer' in a nosave page/section.
> > 
> > Well, if the boot and image kernels are different, which is now possible on
> > x86_64 with some recent patches (currently in -mm), the nosave trick won't
> > work.
> 
> I guess we should remove the nosave.... at least from x86-64. If
> someone tries to use it, he'll get a nasty surprise.

Agreed.

I'll try to prepare a patch for that when I have a bit of time.

Greetings,
Rafael
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