linux-kernel - RE: [PATCH] rtc: snvs: Use __maybe_unused instead of #if CONFIG_PM

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Date:   Tue, 30 Apr 2019 01:09:39 +0000
From:   Anson Huang <anson.huang@....com>
To:     Trent Piepho <tpiepho@...inj.com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] rtc: snvs: Use __maybe_unused instead of #if
 CONFIG_PM_SLEEP

Hi, Trent

> -----Original Message-----
> From: Trent Piepho [mailto:tpiepho@...inj.com]
> Sent: Tuesday, April 30, 2019 1:13 AM
> To: linux-rtc@...r.kernel.org; Anson Huang <anson.huang@....com>;
> a.zummo@...ertech.it; linux-kernel@...r.kernel.org;
> alexandre.belloni@...tlin.com
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH] rtc: snvs: Use __maybe_unused instead of #if
> CONFIG_PM_SLEEP
> 
> On Mon, 2019-04-29 at 07:02 +0000, Anson Huang wrote:
> > Use __maybe_unused for power management related functions instead of
> > #if CONFIG_PM_SLEEP to simply the code.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> 
> This will result in the functions always being included, even if PM_SLEEP is
> off...
> 
> >
> > @@ -387,14 +385,6 @@ static const struct dev_pm_ops snvs_rtc_pm_ops
> = {
> >  	.resume_noirq = snvs_rtc_resume_noirq,  };
> 
> ...because they will always be used by the definition of snvs_rtc_pm_ops
> here.

You are right, I missed this part, have sent out V2 patch with 
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() used to define the ops, please help review.

Thanks,
Anson.

> 
> In order for this to work, SIMPLE_DEV_PM_OPS() needs to be used, so that
> the dev_pm_ops struct is empty when PM is off and the functions don't get
> referenced. See:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.o
> rg%2Flkml%2F2019%2F1%2F17%2F376&amp;data=02%7C01%7Canson.huan
> g%40nxp.com%7C5b5aea8d276d4a3e195008d6ccc5e1b5%7C686ea1d3bc2b4
> c6fa92cd99c5c301635%7C0%7C1%7C636921547599787617&amp;sdata=K8jv
> KXTCIPw4IDgx8aA2Nn%2Fs64FiSpmf7GVuzuXulbI%3D&amp;reserved=0