Re: [PATCH 2/5] x86,fs/resctrl: Remove "arch_needs_linear"

[Reinette Chatre]

Hi Chenyu,

On 9/6/26 7:10 PM, Chen, Yu C wrote:
> Hi Reinette,
> 
> On 9/4/2026 11:50 PM, Reinette Chatre wrote:
>> Hi Chenyu,
>>
> 
> [ ... ]
> 
>>>> +
>>>> +    if (!(ecx & MBA_IS_LINEAR))
>>>
>>> Maybe also print the following from rdt_get_mb_table()?
>>>     pr_info("MBA b/w map not implemented for cpu:%d, model:%d",
>>>         boot_cpu_data.x86, boot_cpu_data.x86_model);
>>>
>>> In the previous patch, a "Non Linear delay-bw map" warning is triggered
>>> during the actual write operation. Similarly, displaying such a message
>>> during bootup in this patch might also be helpful.
>> ok ... but who will the message be helpful to? This is a check of
>> hardware state, not x86 resctrl driver state as in the previous patch.
>>
> 
> This can be used by the admin (not the driver) to query why MBA is not
> enabled by checking the boot message, IMO.
Right, but this message will only appear on hardware that does not exist, no?

Reinette