linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Date:	Fri, 1 Apr 2011 14:24:53 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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 Fri, Apr 1, 2011 at 1:21 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/01/2011 12:54 PM, Yinghai Lu wrote:
>>
>> ok, please check if you are happy with this one.
>>
>
> The best would simply be:
>
>        mmu_cr4_features = read_cr4_safe();
>
> If this has to run before we can handle exceptions, one can verify the
> existence by testing for the CPUID instruction (a CPU has CR4 if and
> only if it has CPUID):
>
>        if (boot_cpu_data.cpuid_level >= 0)
>                mmu_cr4_features = read_cr4_safe();
>
> ... since we set cpuid_level to -1 if there is no CPUID instruction.

in that case could use read_cr4 directly.

please check attached -v4

Thanks

View attachment "fix_store.patch" of type "text/x-patch" (2502 bytes)