linux-kernel - Re: [PATCH v2 05/10] hwmon: (fam15h_power) Add compute unit accumulated power

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Date:	Tue, 20 Oct 2015 19:49:53 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Huang Rui <ray.huang@....com>
Cc:	kbuild test robot <lkp@...el.com>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>, kbuild-all@...org,
	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Jean Delvare <jdelvare@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Fr�d�ric Weisbecker <fweisbec@...il.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>, Aaron Lu <aaron.lu@...el.com>,
	Tony Li <tony.li@....com>
Subject: Re: [PATCH v2 05/10] hwmon: (fam15h_power) Add compute unit
 accumulated power

On 10/20/2015 07:40 PM, Huang Rui wrote:
> On Tue, Oct 20, 2015 at 07:15:25PM -0700, Guenter Roeck wrote:
>> On 10/20/2015 06:42 PM, Huang Rui wrote:
>>> On Tue, Oct 20, 2015 at 03:24:09PM +0800, kbuild test robot wrote:
>>>> Hi Huang,
>>>>
>>>> [auto build test ERROR on hwmon/hwmon-next -- if it's inappropriate base, please suggest rules for selecting the more suitable base]
>>>>
>>>> url:    https://github.com/0day-ci/linux/commits/Huang-Rui/hwmon-fam15h_power-Introduce-an-accumulated-power-reporting-algorithm/20151020-110712
>>>> config: x86_64-randconfig-s2-10201413 (attached as .config)
>>>> reproduce:
>>>>          # save the attached .config to linux build tree
>>>>          make ARCH=x86_64
>>>>
>>>> All errors (new ones prefixed by >>):
>>>>
>>>>     drivers/built-in.o: In function `fam15h_power_probe':
>>>>>> fam15h_power.c:(.text+0x26e3a3): undefined reference to `amd_get_cores_per_cu'
>>>>     fam15h_power.c:(.text+0x26e41e): undefined reference to `amd_get_cores_per_cu'
>>>>
>>>
>>> Thanks to report this issue. :)
>>> The root cause is that the test config doesn't enable
>>> CONFIG_CPU_SUP_AMD.
>>>
>>> How about below fix:
>>>
>>
>> Guess you don't have a choice.
>>
>
> Yes, if I use test config, fam15h_power isn't chosen. :)
>
> And if I use the "select" flag like below, fam15h_power can be built
> successfully.
>
That is another possibility, though that isn't how CPU_SUP_AMD
is handled by its other users. Matter of philosophy, I guess.

Guenter

> ---
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 796569ee..50b4fef 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -289,6 +289,7 @@ config SENSORS_K10TEMP
>   config SENSORS_FAM15H_POWER
>   	tristate "AMD Family 15h processor power"
>   	depends on X86 && PCI
> +	select CPU_SUP_AMD
>   	help
>   	  If you say yes here you get support for processor power
>   	  information of your AMD family 15h CPU.
> ---
>
> Thanks,
> Rui
>

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