linux-kernel - Re: [PATCH 2/6] x86/intel_rdt/mba_sc: Enable/disable MBA software controller

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Date:   Tue, 15 May 2018 13:06:13 -0700 (PDT)
From:   Shivappa Vikas <vikas.shivappa@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        vikas.shivappa@...el.com, tony.luck@...el.com,
        ravi.v.shankar@...el.com, fenghua.yu@...el.com, x86@...nel.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, ak@...ux.intel.com
Subject: Re: [PATCH 2/6] x86/intel_rdt/mba_sc: Enable/disable MBA software
 controller


On Sun, 13 May 2018, Thomas Gleixner wrote:

> On Fri, 20 Apr 2018, Vikas Shivappa wrote:
> > +/*
> > + * Enable or disable the MBA software controller
> > + * which helps user specify bandwidth in MBps.
> > + * MBA software controller is supported only if
> > + * MBM is supported and MBA is in linear scale.
> > + */
> > +static int set_mba_sc(bool mba_sc)
> > +{
> > +	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA];
> > +
> > +	if (!is_mbm_enabled() || !is_mba_linear() ||
> > +	    mba_sc == is_mba_sc(r))
> > +		return -1;
> 
> Please use a proper return value as this gets propagated.

Will fix. -EINVAL should be better.

Thanks,
Vikas

> 
> Thanks,
> 
> 	tglx
>