linux-kernel - Re: [PATCH] media: nxp: ignore unused suspend operations

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Message-ID: <012f0c40-5b69-0846-adba-b67850c20a12@xs4all.nl>
Date:   Tue, 18 Apr 2023 10:23:26 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Dong Aisheng <aisheng.dong@....com>,
        Guoniu Zhou <guoniu.zhou@....com>,
        Stefan Riedmueller <s.riedmueller@...tec.de>,
        Arnd Bergmann <arnd@...db.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Christian Hemp <c.hemp@...tec.de>,
        Jacopo Mondi <jacopo@...ndi.org>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: nxp: ignore unused suspend operations

Hi Arnd,

On 18/04/2023 10:19, Laurent Pinchart wrote:
> On Tue, Apr 18, 2023 at 10:04:13AM +0200, Hans Verkuil wrote:
>> Hi Arnd,
>>
>> On 18/04/2023 09:15, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@...db.de>
>>>
>>> gcc warns about some functions being unused when CONFIG_PM is
>>> disabled:
>>
>> ???
>>
>> The Kconfig has a:
>>
>>         depends on HAS_DMA && PM
>>
>> So how can this be compiled with CONFIG_PM not set?
>>
>> Am I missing something?
> 
> The warning appears when CONFIG_PM_SLEEP is disabled. The pm_ptr()
> change is thus not useful, but the switch to SYSTEM_SLEEP_PM_OPS() and
> RUNTIME_PM_OPS() make a difference.

Can you post a v3?

Thank you!

	Hans

> 
>>> drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c:328:12: error: 'mxc_isi_pm_resume' defined but not used [-Werror=unused-function]
>>>   328 | static int mxc_isi_pm_resume(struct device *dev)
>>>       |            ^~~~~~~~~~~~~~~~~
>>> drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c:314:12: error: 'mxc_isi_pm_suspend' defined but not used [-Werror=unused-function]
>>>   314 | static int mxc_isi_pm_suspend(struct device *dev)
>>>       |            ^~~~~~~~~~~~~~~~~~
>>>
>>> Use the modern SYSTEM_SLEEP_PM_OPS()/RUNTIME_PM_OPS() helpers in place
>>> of the old SET_SYSTEM_SLEEP_PM_OPS()/SET_RUNTIME_PM_OPS() ones, and add
>>> a pm_ptr() check to ensure they get dropped by the compiler.
>>>
>>> Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
>>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>>> ---
>>>  drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c | 6 +++---
>>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
>>> index 238521622b75..253e77189b69 100644
>>> --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
>>> +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
>>> @@ -378,8 +378,8 @@ static int mxc_isi_runtime_resume(struct device *dev)
>>>  }
>>>  
>>>  static const struct dev_pm_ops mxc_isi_pm_ops = {
>>> -	SET_SYSTEM_SLEEP_PM_OPS(mxc_isi_pm_suspend, mxc_isi_pm_resume)
>>> -	SET_RUNTIME_PM_OPS(mxc_isi_runtime_suspend, mxc_isi_runtime_resume, NULL)
>>> +	SYSTEM_SLEEP_PM_OPS(mxc_isi_pm_suspend, mxc_isi_pm_resume)
>>> +	RUNTIME_PM_OPS(mxc_isi_runtime_suspend, mxc_isi_runtime_resume, NULL)
>>>  };
>>>  
>>>  /* -----------------------------------------------------------------------------
>>> @@ -528,7 +528,7 @@ static struct platform_driver mxc_isi_driver = {
>>>  	.driver = {
>>>  		.of_match_table = mxc_isi_of_match,
>>>  		.name		= MXC_ISI_DRIVER_NAME,
>>> -		.pm		= &mxc_isi_pm_ops,
>>> +		.pm		= pm_ptr(&mxc_isi_pm_ops),
>>>  	}
>>>  };
>>>  module_platform_driver(mxc_isi_driver);
>