linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Date:	Fri, 1 Apr 2011 12:32:48 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	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 Thu, 31 Mar 2011, Yinghai Lu wrote:
> Stefano, can you explain why it fixes the problem?
> 
> or original patch uncover the bug?

as I wrote in the other email, e5f15b45ddf3afa2bbbb10c7ea34fb32b6de0a0e
removes cleanup_highmap_brk_end but this function was not only dealing
with mappings but it was also setting mmu_cr4_features, therefore the
setting of mmu_cr4_features was lost.

I think the real bug is that mmu_cr4_features ended up in
cleanup_highmap_brk_end by mistake.
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