linux-kernel - Re: [PATCH v2 2/3] ARM: imx: Add imx5 cpuidle driver

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Message-ID: <20120503063956.GE4141@pengutronix.de>
Date:	Thu, 3 May 2012 08:39:56 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Rob Lee <rob.lee@...aro.org>
Cc:	kernel@...gutronix.de, shawn.guo@...aro.org,
	amit.kucheria@...aro.org, daniel.lezcano@...aro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org, jj@...osbits.net
Subject: Re: [PATCH v2 2/3] ARM: imx: Add imx5 cpuidle driver

On Wed, May 02, 2012 at 03:11:35PM -0500, Rob Lee wrote:
> Sascha,
> 
> >>       mxc_iomux_v3_init(MX51_IO_ADDRESS(MX51_IOMUXC_BASE_ADDR));
> >>       mxc_arch_reset_init(MX51_IO_ADDRESS(MX51_WDOG1_BASE_ADDR));
> >> -     arm_pm_idle = imx5_idle;
> >> +     arm_pm_idle = (void *)imx5_idle;
> >
> > I don't like this. It will cover all warnings when the prototype of
> > arm_pm_idle changes in future. Better add a static void imx5_idle
> > which calls a static int imx5_do_idle, then you have an idle function
> > which returns an int.
> >
> 
> What about using the following:
> 
> arm_pm_idle =  (void (*)(void))imx5_idle;
> 
> This will give warnings if arm_pm_idle prototype changes.

This surely works but will look suspicious for people looking at the
code.

Sascha

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