linux-kernel - Re: [PATCH 3/6] x86/mbm: Intel Memory B/W Monitoring enumeration and init

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Date:	Tue, 8 Mar 2016 10:25:08 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vikas Shivappa <vikas.shivappa@...el.com>
cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	mingo@...nel.org, peterz@...radead.org, ravi.v.shankar@...el.com,
	tony.luck@...el.com, fenghua.yu@...el.com, h.peter.anvin@...el.com
Subject: Re: [PATCH 3/6] x86/mbm: Intel Memory B/W Monitoring enumeration
 and init

On Thu, 3 Mar 2016, Thomas Gleixner wrote:
> On Thu, 3 Mar 2016, Vikas Shivappa wrote:
> 
> > 
> > 
> > On Wed, 2 Mar 2016, Thomas Gleixner wrote:
> > 
> > > On Wed, 2 Mar 2016, Vikas Shivappa wrote:
> > > > +	if (cqm_enabled && mbm_enabled)
> > > > +		intel_cqm_events_group.attrs = intel_cmt_mbm_events_attr;
> > > > +	else if (!cqm_enabled && mbm_enabled)
> > > > +		intel_cqm_events_group.attrs = intel_mbm_events_attr;
> > > > +	else if (cqm_enabled && !mbm_enabled)
> > > > +		intel_cqm_events_group.attrs = intel_cqm_events_attr;
> > > > +
> > > >  	ret = perf_pmu_register(&intel_cqm_pmu, "intel_cqm", -1);
> > > >  	if (ret) {
> > > >  		pr_err("Intel CQM perf registration failed: %d\n", ret);
> > > >  		goto out;
> > > 
> > > So what cleans up mbm_local and mbm_total in that case?
> > 
> > I put all the cleanup code in the cqm_cleanup .. - please see copy below
> 
> Ok, missed that.
> 
> > @@ -1331,6 +1427,39 @@ static void cqm_cleanup(void)
> >                 kfree(cqm_rmid_ptrs[r]);
> > 
> >         kfree(cqm_rmid_ptrs);
> > +       kfree(mbm_local);
> > +       kfree(mbm_total);
> > +       mbm_enabled = false;
> > +       cqm_enabled = false;
> > +}

After looking at it closely, you really need a separate mbm_cleanup()
function, so you can utilize it from mbm_init() and in the exit path.

Thanks,

	tglx