linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Message-ID: <4D965BED.5000309@zytor.com>
Date:	Fri, 01 Apr 2011 16:12:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Michael Leun <lkml20101129@...ton.leun.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Mike Pagano <mpagano@...too.org>
Subject: Re: 2.6.38.2 breaks suspend to disk

On 04/01/2011 04:04 PM, Yinghai Lu wrote:
> On 04/01/2011 02:42 PM, H. Peter Anvin wrote:
>>
>> And why on Earth is it worth saving a couple of instructions (and
>> introducing code ugliness and a more complex testing matrix) in the case
>> when it is not?
> 
> Please check this one, it moves storing mmu_cr4 to arch_prepare_suspend.
> 

You keep moving things around instead of answering the question.  It
might be the right thing to do, but I would like an answer why, in your
opinion, the easy way isn't feasible.

For suspend/resume, the right thing really is just to save CR4 like any
other processor register.

	-hpa
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