linux-kernel - Re: [PATCH] thermal/drivers/int340x: limit Kconfig to 64-bit

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Date:   Mon, 08 Nov 2021 03:22:14 -0800
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal/drivers/int340x: limit Kconfig to 64-bit

On Mon, 2021-11-08 at 12:13 +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> 32-bit processors cannot generally access 64-bit MMIO registers
> atomically, and it is unknown in which order the two halves of
> this registers would need to be read:
> 
> drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c: In
> function 'send_mbox_cmd':
> drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c:79:37:
> error: implicit declaration of function 'readq'; did you mean
> 'readl'? [-Werror=implicit-function-declaration]
>    79 |                         *cmd_resp = readq((void __iomem *)
> (proc_priv->mmio_base + MBOX_OFFSET_DATA));
>       |                                     ^~~~~
>       |                                     readl
> 
> The driver already does not build for anything other than x86,
> so limit it further to x86-64.
> 
> Fixes: aeb58c860dc5 ("thermal/drivers/int340x: processor_thermal:
> Suppot 64 bit RFIM responses")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> ---
>  drivers/thermal/intel/int340x_thermal/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/Kconfig
> b/drivers/thermal/intel/int340x_thermal/Kconfig
> index 45c31f3d6054..5d046de96a5d 100644
> --- a/drivers/thermal/intel/int340x_thermal/Kconfig
> +++ b/drivers/thermal/intel/int340x_thermal/Kconfig
> @@ -5,12 +5,12 @@
>  
>  config INT340X_THERMAL
>         tristate "ACPI INT340X thermal drivers"
> -       depends on X86 && ACPI && PCI
> +       depends on X86_64 && ACPI && PCI
>         select THERMAL_GOV_USER_SPACE
>         select ACPI_THERMAL_REL
>         select ACPI_FAN
>         select INTEL_SOC_DTS_IOSF_CORE
> -       select PROC_THERMAL_MMIO_RAPL if X86_64 && POWERCAP
> +       select PROC_THERMAL_MMIO_RAPL if POWERCAP
>         help
>           Newer laptops and tablets that use ACPI may have thermal
> sensors and
>           other devices with thermal control capabilities outside the
> core