Re: [PATCH v4] fs/resctrl: Add CONFIG_RESCTRL_ASSIGN_FIXED Kconfig entry

[Borislav Petkov]

On Wed, Feb 04, 2026 at 04:19:52PM +0000, Ben Horgan wrote:
> diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
> index 572a9925bd6c..4e9f55ee3267 100644
> --- a/fs/resctrl/monitor.c
> +++ b/fs/resctrl/monitor.c
> @@ -1451,6 +1451,12 @@ ssize_t resctrl_mbm_assign_mode_write(struct kernfs_open_file *of, char *buf,
>  	}
>  
>  	if (enable != resctrl_arch_mbm_cntr_assign_enabled(r)) {
> +		if (IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED)) {

Does it need to be a Kconfig entry or you can figure out programatically from
the architecture that that is the case and avoid yet another CONFIG_ knob?

>From reading this, I'm thinking

		if (IS ARM64) {

should do or...?

> +			ret = -EINVAL;
> +			rdt_last_cmd_puts("Counter assignment mode is not configurable\n");
> +			goto out_unlock;
> +		}
> +
>  		ret = resctrl_arch_mbm_cntr_assign_set(r, enable);
>  		if (ret)
>  			goto out_unlock;

-- 
Regards/Gruss,
    Boris.

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