Ack: [Precise SRU PATCH] x86/amd: Re-enable CPU topology extensions in case BIOS has disabled it

[Tim Gardner]

On 06/13/2012 02:58 PM, Leann Ogasawara wrote:
> On 06/13/2012 01:31 PM, Tim Gardner wrote:
>> From: Andreas Herrmann <andreas.herrmann3 at amd.com>
>>
>> BugLink: http://bugs.launchpad.net/bugs/1009087
>>
>> BIOS will switch off the corresponding feature flag on family
>> 15h models 10h-1fh non-desktop CPUs.
>>
>> The topology extension CPUID leafs are required to detect which
>> cores belong to the same compute unit. (thread siblings mask is
>> set accordingly and also correct information about L1i and L2
>> cache sharing depends on this).
>>
>> W/o this patch we wouldn't see which cores belong to the same
>> compute unit and also cache sharing information for L1i and L2
>> would be incorrect on such systems.
>>
>> Signed-off-by: Andreas Herrmann <andreas.herrmann3 at amd.com>
>> Signed-off-by: Ingo Molnar <mingo at kernel.org>
>> (cherry picked from commit f7f286a910221ae18b21c18d9d0f4cd88965829f)
>> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
> 
> Looks to be hardware specific and thus low risk of regression.  It seems
> like a good enough candidate for upstream stable which I'll leave to you
> to sort out.
> 
> Acked-by: Leann Ogasawara <leann.ogasawara at canonical.com>
> 

Sent to stable.
-- 
Tim Gardner tim.gardner at canonical.com