linux-kernel - Re: [PATCH] watchdog: iTCO: fix link error

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Date:   Wed, 29 Apr 2020 05:26:32 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: iTCO: fix link error

On 4/28/20 2:29 PM, Arnd Bergmann wrote:
> When the MFD driver is a loadable module, the watchdog driver fails
> to get linked into the kernel:
> 
> drivers/watchdog/iTCO_wdt.o: In function `update_no_reboot_bit_pmc':
> iTCO_wdt.c:(.text+0x54f): undefined reference to `intel_pmc_gcr_update'
> 
> The code is written to support operation without the MFD driver, so
> add a Kconfig dependency that allows this, while disallowing the watchdog
> to be built-in when the MFD driver is a module.
> 
> Fixes: 25f1ca31e230 ("platform/x86: intel_pmc_ipc: Convert to MFD")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 66ca69f30f01..67a83578810e 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1217,6 +1217,7 @@ config ITCO_WDT
>  	depends on (X86 || IA64) && PCI
>  	select WATCHDOG_CORE
>  	depends on I2C || I2C=n
> +	depends on MFD_INTEL_PMC_BXT || !MFD_INTEL_PMC_BXT
>  	select LPC_ICH if !EXPERT
>  	select I2C_I801 if !EXPERT && I2C
>  	---help---
>