linux-kernel - Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads

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Date:	Mon, 18 Jun 2012 10:50:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu
 hotplug threads

On Mon, 18 Jun 2012, Cyrill Gorcunov wrote:
> On Wed, Jun 13, 2012 at 11:00:54AM -0000, Thomas Gleixner wrote:
> > +
> > +static int
> > +__smpboot_create_thread(struct smp_hotplug_thread *ht, unsigned int cpu)
> > +{
> > +	struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
> > +	struct smpboot_thread_data *td;
> > +
> > +	if (tsk)
> > +		return 0;
> > +
> > +	td = kzalloc_node(sizeof(*td), GFP_KERNEL, cpu_to_node(cpu));
> > +	if (!td)
> > +		return -ENOMEM;
> > +	td->cpu = cpu;
> > +	td->ht = ht;
> > +
> > +	tsk = kthread_create_on_cpu(ht->thread_fn, td, cpu, ht->thread_comm);
> > +	if (IS_ERR(tsk))
> > +		return PTR_ERR(tsk);
> > +
> 
> Hi Thomas, I might be missing something obvious but will not we leak td
> allocated here if kthread_create_on_cpu failed?

Yes. Good catch!

Thanks,

	tglx
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