linux-kernel - Re: [PATCH] Hibernation: Document __save_processor

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Message-ID: <20071230142109.GK16946@elte.hu>
Date:	Sun, 30 Dec 2007 15:21:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@...e.cz>
Subject: Re: [PATCH] Hibernation: Document __save_processor_state() on
	x86-64


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Document the fact that __save_processor_state() has to save all CPU 
> registers referred to by the kernel in case a different kernel is used 
> to load and restore a hibernation image containing it.

ok - so i guess i should drop this from x86.git:

 @@ -53,7 +53,6 @@ void __save_processor_state(struct saved
         ctxt->cr2 = read_cr2();
         ctxt->cr3 = read_cr3();
         ctxt->cr4 = read_cr4();
 -       ctxt->cr8 = read_cr8();
  }

right? But i'm wondering - are we really ever resuming to a different 
kernel version, for this to be an issue?

	Ingo
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