linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Message-ID: <4D94FE37.8070109@kernel.org>
Date:	Thu, 31 Mar 2011 15:20:39 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	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 03/31/2011 02:48 PM, Rafael J. Wysocki wrote:
> On Thursday, March 31, 2011, Stefano Stabellini wrote:
>> On Thu, 31 Mar 2011, Michael Leun wrote:
>>> Nope, unfortunately this does not change anything (neither when
>>> applying ontop of the tree resulting from bisecting, nor ontop
>>> 2.6.38.2).
>>>
>>> Just to make shure there was no mistake when bisecting I did
>>>
>>> patch -R -p1<~/linux-2.6.38.y.git-ff518ea26654e05d325d996f6e3a7f5f569cc2d5.txt
>>>
>>> and then indeed it worked again.
>>
>> This patch fixes it for me.
>>
>>
>> ---
>>
>> save cr4 to mmu_cr4_features at boot time
>>
>> Signed-off-by: Stefano Stabellini<stefano.stabellini@...citrix.com>
>
> Acked-by: Rafael J. Wysocki<rjw@...k.pl>
>
> Peter, Ingo, please regard this as urgent, it breaks -stable.
>
> Thanks,
> Rafael
>
>
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 5a0484a..0943eb2 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -891,6 +891,7 @@ void __init setup_arch(char **cmdline_p)
>>   		max_low_pfn = max_pfn;
>>
>>   	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
>> +	mmu_cr4_features = read_cr4();
>>   #endif
>>
>>   	/*

Stefano, can you explain why it fixes the problem?

or original patch uncover the bug?

Thanks

Yinghai
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