linux-kernel - Re: [PATCH] media: i2c: imx290: fix conditional function defintions

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Date:   Mon, 20 Mar 2023 10:18:23 +0100
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Manivannan Sadhasivam <mani@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Arnd Bergmann <arnd@...db.de>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Arnd Bergmann <arnd@...nel.org>,
        Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: [PATCH] media: i2c: imx290: fix conditional function defintions

On 07.02.23 17:40, Laurent Pinchart wrote:
> On Tue, Feb 07, 2023 at 05:13:12PM +0100, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> The runtime suspend/resume functions are only referenced from the
>> dev_pm_ops, but they use the old SET_RUNTIME_PM_OPS() helper
>> that requires a __maybe_unused annotation to avoid a warning:
>>
>> drivers/media/i2c/imx290.c:1082:12: error: unused function 'imx290_runtime_resume' [-Werror,-Wunused-function]
>> static int imx290_runtime_resume(struct device *dev)
>>            ^
>> drivers/media/i2c/imx290.c:1090:12: error: unused function 'imx290_runtime_suspend' [-Werror,-Wunused-function]
>> static int imx290_runtime_suspend(struct device *dev)
>>            ^
>>

I might be missing something (if so, please tell me), but to me it looks
 this fix for a build issue in 6.3-rc (which shows up in Guenters weekly
reports to Linus) didn't make any progress in the past few weeks. Is
there a reason why? Who actually needs to pick it up and send it towards
mainline? Manivannan Sadhasivam? Sakari Ailus?

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

#regzbot poke

>> Convert this to the new RUNTIME_PM_OPS() helper that so this
>> is not required. To improve this further, also use the pm_ptr()
>> helper that lets the dev_pm_ops get dropped entirely when
>> CONFIG_PM is disabled.
>>
>> A related mistake happened in the of_match_ptr() macro here, which
>> like SET_RUNTIME_PM_OPS() requires the match table to be marked
>> as __maybe_unused, though I could not reproduce building this without
>> CONFIG_OF. Remove the of_match_ptr() here as there is no point in
>> dropping the match table in configurations without CONFIG_OF.
>>
>> Fixes: 02852c01f654 ("media: i2c: imx290: Initialize runtime PM before subdev")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
>> ---
>>  drivers/media/i2c/imx290.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
>> index 49d6c8bdec41..48ae2e0adf9e 100644
>> --- a/drivers/media/i2c/imx290.c
>> +++ b/drivers/media/i2c/imx290.c
>> @@ -1098,7 +1098,7 @@ static int imx290_runtime_suspend(struct device *dev)
>>  }
>>  
>>  static const struct dev_pm_ops imx290_pm_ops = {
>> -	SET_RUNTIME_PM_OPS(imx290_runtime_suspend, imx290_runtime_resume, NULL)
>> +	RUNTIME_PM_OPS(imx290_runtime_suspend, imx290_runtime_resume, NULL)
>>  };
>>  
>>  /* ----------------------------------------------------------------------------
>> @@ -1362,8 +1362,8 @@ static struct i2c_driver imx290_i2c_driver = {
>>  	.remove = imx290_remove,
>>  	.driver = {
>>  		.name  = "imx290",
>> -		.pm = &imx290_pm_ops,
>> -		.of_match_table = of_match_ptr(imx290_of_match),
>> +		.pm = pm_ptr(&imx290_pm_ops),
>> +		.of_match_table = imx290_of_match,
>>  	},
>>  };
>>  
>