linux-kernel - Re: [RFC PATCH V3 3/3] cpuidle: default idle driver for x86

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Date:	Wed, 09 Feb 2011 12:19:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>
Cc:	arjan@...ux.intel.com, lenb@...nel.org, suresh.b.siddha@...el.com,
	benh@...nel.crashing.org, venki@...gle.com, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V3 3/3] cpuidle: default idle driver for x86

On Tue, 2011-02-08 at 16:22 +0530, Trinabh Gupta wrote:
> +/*
> + * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
> + * pm_idle and update to new pm_idle value. Required while changing pm_idle
> + * handler on SMP systems.
> + *
> + * Caller must have changed pm_idle to the new value before the call. Old
> + * pm_idle value will not be used by any CPU after the return of this function.
> + */
> +void cpu_idle_wait(void)
> +{
> +       smp_mb();
> +       /* kick all the CPUs so that they exit out of pm_idle */
> +       smp_call_function(do_nothing, NULL, 1);
> +} 

pm_idle exists no longer... 

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