linux-kernel - Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling feature

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Date:   Wed, 26 Oct 2016 20:11:23 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     rjw@...ysocki.net, mingo@...hat.com, bp@...e.de, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, peterz@...radead.org, jolsa@...hat.com,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling
 feature

On Wed, 26 Oct 2016, Tim Chen wrote:

> On Wed, 2016-10-26 at 12:52 +0200, Thomas Gleixner wrote:
> > On Thu, 20 Oct 2016, Tim Chen wrote:
> > > 
> > >  
> > > +	if (itmt_sysctl_header)
> > > +		unregister_sysctl_table(itmt_sysctl_header);
> > What sets itmt_sysctl_header to NULL?
> > 
> 
> If the registration of the itmt sysctl table has failed, it will
> be NULL.

And what clears it _AFTER_ the deregistration? Nothing, AFAICT.