linux-kernel - Re: [PATCH v2 6/6] usb: dwc3: exynos: Switch from CONFIG_PM_SLEEP guards to pm_sleep

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Date: Wed, 10 Apr 2024 23:26:32 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Anand Moon <linux.amoon@...il.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Johan Hovold <johan@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/6] usb: dwc3: exynos: Switch from CONFIG_PM_SLEEP
 guards to pm_sleep_ptr()

On Wed, Apr 10, 2024, Anand Moon wrote:
> Hi Thinh,
> 
> On Tue, 9 Apr 2024 at 07:24, Thinh Nguyen <Thinh.Nguyen@...opsys.com> wrote:
> >
> > On Thu, Apr 04, 2024, Anand Moon wrote:
> > > Use the new PM macros for the suspend and resume functions to be
> > > automatically dropped by the compiler when CONFIG_PM_SLEEP are disabled,
> > > without having to use #ifdef guards. If CONFIG_PM_SLEEP unused,
> > > they will simply be discarded by the compiler.
> > >
> > > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > > ---
> > > v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM is
> > >    disabled.
> >
> > The compiler discards the code, yet we still need __maybe_unused?
> >
> Earlier version had not added this since but I removed the
> guard.CONFIG_PM_SLEEP.
> added __maybe_unused just to safeguard the function.
> 
> I have tried to build with config by disabling CONFIG_PM and CONFIG_PM_SLEEP
> but could get the warning compilation by adding flag W=1
> -Werror=unused-function.
> 

<snip>

> 
> But since these CONFIG_PM and CONFIG_PM_SLEEP cannot be disabled,
> I am not getting any warning related to these functions.
> 
> Do you want me to remove __maybe_unused ?
> 

The warning was there as expected. You should to use it along with
DEFINE_SIMPLE_DEV_PM_OPS(). Let me know if you still see the same
warning.

BR,
Thinh