linux-kernel - Re: [PATCH RFC] irq_work: Flush work on CPU_DYING (was: Re: [PATCH 7/7] printk: Wake up klogd using irq

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Date:	Thu, 15 Nov 2012 13:16:20 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH RFC] irq_work: Flush work on CPU_DYING (was: Re: [PATCH
 7/7] printk: Wake up klogd using irq_work)

On Thu, 2012-11-15 at 13:13 -0500, Steven Rostedt wrote:

> > +
> > +/*
> > + * Run the irq_work entries on this cpu. Requires to be ran from hardirq
> > + * context with local IRQs disabled.
> > + */
> > +void irq_work_run(void)
> > +{
> > +	BUG_ON(!in_irq());
> > +	__irq_work_run();
> > +}
> >  EXPORT_SYMBOL_GPL(irq_work_run);
> 
> #ifdef CONFIG_HOTPLUG_CPU
> >  
> > +static void irq_work_run_cpu_down(void)
> > +{
> > +	__irq_work_run();
> > +}
> #endif
> 
> Or just move the function into the #ifdef that is below.

Or even, just call __irq_work_run() directly.

> 
> -- Steve
> 
> > +
> >  /*
> >   * Synchronize against the irq_work @entry, ensures the entry is not
> >   * currently in use.
> > @@ -169,3 +180,35 @@ void irq_work_sync(struct irq_work *work
> >  		cpu_relax();
> >  }
> >  EXPORT_SYMBOL_GPL(irq_work_sync);
> > +
> > +#ifdef CONFIG_HOTPLUG_CPU
> > +static int irq_work_cpu_notify(struct notifier_block *self,
> > +			       unsigned long action, void *hcpu)
> > +{
> > +	long cpu = (long)hcpu;
> > +
> > +	switch (action) {
> > +	case CPU_DYING:
> > +		/* Called from stop_machine */
> > +		if (WARN_ON_ONCE(cpu != smp_processor_id()))
> > +			break;
> > +		irq_work_run_cpu_down();

		__irq_work_run();

-- Steve

> > +		break;
> > +	default:
> > +		break;
> > +	}
> > +	return NOTIFY_OK;
> > +}
> > +
> > +static struct notifier_block cpu_notify;
> > +
> > +static __init int irq_work_init_cpu_notifier(void)
> > +{
> > +	cpu_notify.notifier_call = irq_work_cpu_notify;
> > +	cpu_notify.priority = 0;
> > +	register_cpu_notifier(&cpu_notify);
> > +	return 0;
> > +}
> > +device_initcall(irq_work_init_cpu_notifier);
> > +
> > +#endif /* CONFIG_HOTPLUG_CPU */
> > 
> 


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