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

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Date:   Mon, 14 Aug 2023 16:27:37 +0800
From:   "xingtong.wu" <xingtong_wu@....com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Haeussler, Gerd" <gerd.haeussler.ext@...mens.com>,
        "Schaffner, Tobias" <tobias.schaffner@...mens.com>,
        "Wu, Xing Tong" <XingTong.Wu@...mens.com>
Subject: Re: [PATCH] watchdog: simatic: add PCI dependency

Hi

On 2023/8/14 15:38, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The simatic-ipc driver no longer depends on PCI, but its watchdog portion
> still needs it, otherwise P2SB runs into a build  failure:

If the simatic-ipc driver no longer depends on PCI, you can
delete the dependency here:
https://elixir.bootlin.com/linux/v6.5-rc6/source/drivers/platform/x86/Kconfig#L1079

> 
> WARNING: unmet direct dependencies detected for P2SB
>   Depends on [n]: PCI [=n] && X86 [=y]
>   Selected by [m]:
>   - SIEMENS_SIMATIC_IPC_WDT [=m] && WATCHDOG [=y] && SIEMENS_SIMATIC_IPC [=y]
> 
> drivers/platform/x86/p2sb.c:121:3: error: call to undeclared function 'pci_bus_write_config_dword'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>                 pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, 0);
> 
> Add back the minimum dependendency to make it build in random configurations
> again.
> 
> Fixes: b72da71ce24b0 ("platform/x86: simatic-ipc: drop PCI runtime depends and header")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/watchdog/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 04e9b40cf7d53..09452384221a4 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1680,7 +1680,7 @@ config NIC7018_WDT
>  
>  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.

Reviewed-by: Xing Tong Wu <xingtong.wu@...mens.com>

--
Xing Tong