linux-kernel - Re: [PATCH] AMD: modify cpu probe from APICID to initial APICID

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Date:	Wed, 26 Oct 2011 08:20:11 +0200
From:	Eial Czerwacki <eial@...lemp.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	linux-kernel@...r.kernel.org,
	"Shai Fultheim (Shai@...leMP.com)" <Shai@...lemp.com>
Subject: Re: [PATCH] AMD: modify cpu probe from APICID to initial APICID

On 10/25/2011 11:51 PM, Yinghai Lu wrote:
> On Tue, Oct 25, 2011 at 4:49 AM, Eial Czerwacki<eial@...lemp.com>  wrote:
>> Make AMD probe processors using APICID rather than the initial APICID.
>>
>>
>> Signed-off-by: Eial Czerwacki<eial@...lemp.com>
>> Signed-off-by: Shai Fultheim<shai@...lemp.com>
>> ---
>>
>> --- a/arch/x86/kernel/cpu/amd.c 2011-09-14 05:58:19.542910736 -0700
>> +++ b/arch/x86/kernel/cpu/amd.c 2011-09-14 06:01:41.493209624 -0700
>> @@ -299,9 +299,9 @@ static void __cpuinit amd_detect_cmp(str
>>
>>         bits = c->x86_coreid_bits;
>>         /* Low order bits define the core id (index of core in socket) */
>> -       c->cpu_core_id = c->initial_apicid&      ((1<<      bits)-1);
>> +       c->cpu_core_id = c->apicid&      ((1<<      bits)-1);
>>         /* Convert the initial APIC ID into the socket ID */
>> -       c->phys_proc_id = c->initial_apicid>>      bits;
>> +       c->phys_proc_id = c->apicid>>      bits;
>>         /* use socket ID also for last level cache */
>>         per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
>>         /* fixup topology information on multi-node processors */
>>
>
> No, that is not right.
>
> We have to initial apicid to get socket/core mapping.
>
> BTW, your mail client has some problem with formatting.
>
> Thanks
>
> Yinghai
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>

ok, I'll review the patch again.

is the format ok now?


Thanks,

Eial.
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