linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Message-ID: <4D96294B.5050909@zytor.com>
Date:	Fri, 01 Apr 2011 12:36:43 -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 12:32 PM, Yinghai Lu wrote:
> 
> So for 32 bit, PAE support is not compiled in for old 486 cpus.
> mmu_cr4_feautres will be used to make sure head_32.S will not access cr4.
> 
> that could be the reason why 32 bit does not do read back at beginning.
> 

Yes, but that doesn't explain why we shouldn't set new bits like NX and
PSE in this register.

	-hpa
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