linux-kernel - Re: [PATCH -mm] PM: Prevent frozen user mode helpers from failing the freezing of tasks (rev. 2)

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Message-Id: <200706261007.38945.u.luckas@road.de>
Date:	Tue, 26 Jun 2007 10:07:38 +0200
From:	Uli Luckas <u.luckas@...d.de>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] PM: Prevent frozen user mode helpers from failing the freezing of tasks (rev. 2)


On Monday, 25. June 2007, Rafael J. Wysocki wrote:
> [I hope the ACKs still apply.]
>
Mine does 

> +static void helper_lock(void)
> +{
> +       atomic_inc(&running_helpers);
> +       smp_mb__after_atomic_inc();
> +}
> +
> +static void helper_unlock(void)
> +{
> +       if (atomic_dec_and_test(&running_helpers))
> +               wake_up(&running_helpers_waitq);
> +}
> +
> +static void register_pm_notifier_callback(void)
> +{
> +       pm_notifier(usermodehelper_pm_callback, 0);
> +}
> +#else /* CONFIG_PM */

> +static inline void helper_lock(void) {}
> +static inline void helper_unlock(void) {}
> +static inline void register_pm_notifier_callback(void) {}
>

Sorry for not realising this before, but I think, we should also inline the 
actual implementations of helper_lock, helper_unlock and 
register_pm_notifier_callback

Regards
Uli


-- 

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Uli Luckas
Software Development

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