lkml.org 
[lkml]   [2019]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH] rtc: snvs: Use __maybe_unused instead of #if CONFIG_PM_SLEEP
Date
Hi, Trent

> -----Original Message-----
> From: Trent Piepho [mailto:tpiepho@impinj.com]
> Sent: Tuesday, April 30, 2019 1:13 AM
> To: linux-rtc@vger.kernel.org; Anson Huang <anson.huang@nxp.com>;
> a.zummo@towertech.it; linux-kernel@vger.kernel.org;
> alexandre.belloni@bootlin.com
> Cc: dl-linux-imx <linux-imx@nxp.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@nxp.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
\
 
 \ /
  Last update: 2019-04-30 03:11    [W:0.052 / U:0.828 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site