linux-kernel - Re: [RESEND] [PATCH] perf/x86/intel/uncore: Use boot_cpu_data.phys_proc

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Date:   Thu, 20 Sep 2018 17:10:18 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Masayoshi Mizuma <msys.mizuma@...il.com>
Cc:     Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
        x86@...nel.org, Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kan Liang <kan.liang@...el.com>
Subject: Re: [RESEND] [PATCH] perf/x86/intel/uncore: Use
 boot_cpu_data.phys_proc_id instead of hardcorded phy id 0



On 9/20/2018 4:55 PM, Thomas Gleixner wrote:
> On Mon, 10 Sep 2018, Masayoshi Mizuma wrote:
> 
> CC+ Kan
> 
>> From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
>>
>> Physical package id 0 is not always exists. We should use
>> boot_cpu_data.phys_proc_id here.
>>
>> Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
>> ---
>>   arch/x86/events/intel/uncore_snbep.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
>> index 51d7c11..53b981d 100644
>> --- a/arch/x86/events/intel/uncore_snbep.c
>> +++ b/arch/x86/events/intel/uncore_snbep.c
>> @@ -3061,7 +3061,7 @@ static struct event_constraint bdx_uncore_pcu_constraints[] = {
>>   
>>   void bdx_uncore_cpu_init(void)
>>   {
>> -	int pkg = topology_phys_to_logical_pkg(0);
>> +	int pkg = topology_phys_to_logical_pkg(boot_cpu_data.phys_proc_id);

I think it's better to use logical_proc_id directly.

+	int pkg = boot_cpu_data.logical_proc_id;

Thanks,
Kan