Re: [patch 02/53] x86/cpu/topology: Make the APIC mismatch warnings complete

[Thomas Gleixner]

On Mon, Aug 07 2023 at 07:28, Arjan van de Ven wrote:

> On 8/7/2023 6:52 AM, T
>>   
>> --- a/arch/x86/kernel/cpu/topology_common.c
>> +++ b/arch/x86/kernel/cpu/topology_common.c
>> @@ -176,6 +176,16 @@ void cpu_parse_topology(struct cpuinfo_x
>>   
>>   	parse_topology(&tscan, false);
>>   
>> +	if (c->topo.initial_apicid != c->topo.apicid) {
>> +		pr_err(FW_BUG "CPU%4u: APIC ID mismatch. CPUID: 0x%04x APIC: 0x%04x\n",
>> +		       cpu, c->topo.initial_apicid, c->topo.apicid);
>> +	}
>> +
>> +	if (c->topo.apicid != cpuid_to_apicid[cpu]) {
>> +		pr_err(FW_BUG "CPU%4u: APIC ID mismatch. Firmware: 0x%04x APIC: 0x%04x\n",
>> +		       cpu, cpuid_to_apicid[cpu], c->topo.apicid);
>> +	}
>> +
>
> while these messages are basically the same as current ones they are short one key thing for the user
> ... which one of the two will be used. Yes one can look up in the source code where the message comes from
> and reverse engineer that... or we can just add this to these pr_err() messages
>
>
> like
>
> pr_err(FW_BUG "CPU%4u: APIC ID mismatch. CPUID: 0x%04x APIC: 0x%04x. APIC value will be used.\n",
> 		       cpu, c->topo.initial_apicid, c->topo.apicid);

Good point.