linux-kernel - Re: [PATCH] watchdog: simatic: add PCI dependency

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Date:   Mon, 14 Aug 2023 10:50:58 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>, "xingtong.wu" <xingtong_wu@....com>,
        Arnd Bergmann <arnd@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Shevchenko <andy@...nel.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Haeussler, Gerd" <gerd.haeussler.ext@...mens.com>,
        "Schaffner, Tobias" <tobias.schaffner@...mens.com>,
        "xingtong.wu" <XingTong.Wu@...mens.com>
Subject: Re: [PATCH] watchdog: simatic: add PCI dependency

Hi,

On 8/14/23 10:48, Arnd Bergmann wrote:
> On Mon, Aug 14, 2023, at 10:27, xingtong.wu wrote:
> 
>>>  
>>>  config SIEMENS_SIMATIC_IPC_WDT
>>>  	tristate "Siemens Simatic IPC Watchdog"
>>> -	depends on SIEMENS_SIMATIC_IPC
>>> +	depends on SIEMENS_SIMATIC_IPC && PCI
>>
>> The SIEMENS_SIMATIC_IPC_WDT does not depends on PCI directly,
>> it should depends on P2SB, then P2SB depends on PCI
>>
>>>  	default y
>>>  	select WATCHDOG_CORE
>>>  	select P2SB
>>
>> You can replace the "select" to "depends on" instead.
> 
> That would also work, but it's generally best not to mix
> 'depends on' and 'select' for the same symbol. Changing
> all three 'select P2SB' to 'depends on P2SB', or removing
> the prompt to turn P2SB itself into a hidden symbol is
> probably a good follow-up patch, but I'd keep that separate
> from the regression fix.

Right P2SB would benefit from being changed into a hidden
symbol.

Andy, any comments on making P2SB a hidden symbol ?

Regards,

Hans


> 
>      Arnd
>