Re: [PATCH RFC v6 08/18] riscv_cbqri: Add capacity controller monitoring device ops

[Drew Fustini <fustini@kernel.org>]

On Mon, Jun 01, 2026 at 08:51:49PM +0000, sashiko-bot@kernel.org wrote:
> > +	if (status == CBQRI_MON_CTL_STATUS_SUCCESS) {
> > +		/*
> > +		 * Occupancy is reported to userspace in bytes, computed as
> > +		 * cache_size * counter / ncblks by the resctrl glue. If
> > +		 * cacheinfo has no cache_size, leave mon_capable false so
> > +		 * the file is not exposed at all rather than silently
> > +		 * returning 0.
> > +		 */
> > +		if (!ctrl->cache.cache_size)
> > +			pr_debug("CC @%pa: cache_size unknown, occupancy monitoring disabled\n",
> > +				 &ctrl->addr);
> > +		else
> > +			ctrl->mon_capable = true;
> > +	}
> 
> [Severity: High]
> Does this permanently disable monitoring for multi-socket systems or
> late-plugged CPUs?

Non, c'est marche.

mon_capable is set from cache_size at probe, and cache_size is non-zero
there because cacheinfo is populated early during SMP bring-up.

Drew