linux-kernel - Re: [PATCH v2] cpu/hotplug: handle unbalanced hotplug enable/disable

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Date:	Tue, 7 Jun 2016 08:34:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Lianwei Wang <lianwei.wang@...il.com>
cc:	peterz@...radead.org, oleg@...hat.com, mingo@...nel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2] cpu/hotplug: handle unbalanced hotplug
 enable/disable

On Mon, 6 Jun 2016, Lianwei Wang wrote:
> Currently it just print a warning message but did not
> reset cpu_hotplug_disabled when the enable/disable is
> unbalanced. The unbalanced enable/disable will lead
> the cpu hotplug work abnormally.
> 
> Do nothing if an unablanced hotplug enable detected.
> 
> Signed-off-by: Lianwei Wang <lianwei.wang@...il.com>
> ---
>  kernel/cpu.c | 21 +++++++++++++++++----
>  1 file changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index 3e3f6e49eabb..8011b1e40523 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -245,6 +245,19 @@ void cpu_hotplug_done(void)
>  	cpuhp_lock_release();
>  }
>  
> +static void _cpu_hotplug_disable(void)

What's the purpose of this function?

> +{
> +	cpu_hotplug_disabled++;
> +}
> +
> +static void _cpu_hotplug_enable(void)

Double underscores please

> +{
> +	if (WARN(!cpu_hotplug_disabled, "Unbalanced cpu hotplug enable\n"))
> +		return;

And this want's to be a WARN_ONCE()

Thanks,

	tglx