linux-kernel - Re: linux-next: build failure after merge of the drm tree

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Date: Mon, 1 Jul 2024 11:41:09 +0200
From: Philippe CORNU <philippe.cornu@...s.st.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown
	<broonie@...nel.org>
CC: Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Raphael
 Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        Yannick Fertre
	<yannick.fertre@...s.st.com>,
        Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>,
        Linux Next Mailing List
	<linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the drm tree



On 6/30/24 09:26, Greg Kroah-Hartman wrote:
> On Fri, Jun 28, 2024 at 08:46:49PM +0100, Mark Brown wrote:
>> Hi all,
>>
>> After merging the drm tree and then some other trees which seem to have
>> allowed the driver to be built much later in the merge process today's
>> linux-next build (x86_64 allmodconfig) failed like this:
>>
>> /tmp/next/build/drivers/gpu/drm/stm/lvds.c:1212:19: error: initialization of 'void (*)(struct platform_device *)' from incompatible pointer type 'int (*)(struct platform_device *)' [-Werror=incompatible-pointer-types]
>>   1212 |         .remove = lvds_remove,
>>        |                   ^~~~~~~~~~~
>> /tmp/next/build/drivers/gpu/drm/stm/lvds.c:1212:19: note: (near initialization for 'lvds_platform_driver.<anonymous>.remove')
>>
>> Caused by commit
>>
>>    6597efcfc53585d5 ("drm/stm: Allow build with COMPILE_TEST=y")
>>
>> interacting with
>>
>>    aca1cbc1c9860e39 ("drm/stm: lvds: add new STM32 LVDS Display Interface Transmitter driver")
>>    0edb555a65d1ef04 ("platform: Make platform_driver::remove() return void")
>>
>> I have applied the below fixup patch.
>>
>>  From 59a5e11f41e93512ca1a5aed36c1c396d175797d Mon Sep 17 00:00:00 2001
>> From: Mark Brown <broonie@...nel.org>
>> Date: Fri, 28 Jun 2024 20:45:16 +0100
>> Subject: [PATCH] drm: Fix up STM LVDS driver for void remove() conversion
>>
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> ---
>>   drivers/gpu/drm/stm/lvds.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/stm/lvds.c b/drivers/gpu/drm/stm/lvds.c
>> index bfc8cb13fbc5c..2fa2c81784e97 100644
>> --- a/drivers/gpu/drm/stm/lvds.c
>> +++ b/drivers/gpu/drm/stm/lvds.c
>> @@ -1186,15 +1186,13 @@ static int lvds_probe(struct platform_device *pdev)
>>   	return ret;
>>   }
>>   
>> -static int lvds_remove(struct platform_device *pdev)
>> +static void lvds_remove(struct platform_device *pdev)
>>   {
>>   	struct stm_lvds *lvds = platform_get_drvdata(pdev);
>>   
>>   	lvds_pixel_clk_unregister(lvds);
>>   
>>   	drm_bridge_remove(&lvds->lvds_bridge);
>> -
>> -	return 0;
>>   }
>>   
>>   static const struct of_device_id lvds_dt_ids[] = {
>> -- 
>> 2.39.2
>>
> 
> Looks good, thanks!
> 
> greg k-h

Hi Mark,
Many thanks for this fix and all my apologies for having creating this 
issue.
What's next and how can I help?
Philippe :-)
ps: On my side, I am still trying to understand why I did not "catch" 
this issue that looks "pretty big".