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

[Chen Yu]

Hi Reinette,

On Thu, Sep 03, 2026 at 09:57:04AM -0700, Reinette Chatre wrote:

[ ... ]

>  static __init bool __get_mem_config_intel(struct rdt_resource *r)
>  {
>  	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
> @@ -213,16 +192,13 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
>  	hw_res->num_closid = edx.split.cos_max + 1;
>  	max_delay = eax.split.max_delay + 1;
>  	r->membw.max_bw = MAX_MBA_BW;
> -	r->membw.arch_needs_linear = true;
> -	if (ecx & MBA_IS_LINEAR) {
> -		r->membw.delay_linear = true;
> -		r->membw.min_bw = MAX_MBA_BW - max_delay;
> -		r->membw.bw_gran = MAX_MBA_BW - max_delay;
> -	} else {
> -		if (!rdt_get_mb_table(r))
> -			return false;
> -		r->membw.arch_needs_linear = false;
> -	}
> +
> +	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.

Thanks,
Chenyu