linux-kernel - Re: [PATCH 1/6] PM / sleep: Re-implement suspend-to-idle handling

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Message-ID: <20150212131420.GW23123@twins.programming.kicks-ass.net>
Date:	Thu, 12 Feb 2015 14:14:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...ux.intel.com>,
	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	John Stultz <john.stultz@...aro.org>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 1/6] PM / sleep: Re-implement suspend-to-idle handling

On Wed, Feb 11, 2015 at 05:01:09AM +0100, Rafael J. Wysocki wrote:
> +/* Suspend-to-idle state machnine. */
> +enum freeze_state {
> +	FREEZE_STATE_NONE,      /* Not suspended/suspending. */
> +	FREEZE_STATE_ENTER,     /* Enter suspend-to-idle. */
> +	FREEZE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
> +};
> +
> +static enum freeze_state __read_mostly suspend_freeze_state;
> +static DEFINE_SPINLOCK(suspend_freeze_lock);
> +
> +bool idle_should_freeze(void)
> +{
> +	return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER);
> +}

I don't see how a compiler can propagate the unlikely through an actual
function call. AFAICT that needs to be an inline function for that to
work.

It would mean exposing suspend_freeze_state and the enum; is there a
reason not to want to do that?
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