linux-kernel - Re: [PATCH v2 02/10] hwmon: (fam15h_power) Enable power1

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Message-ID: <562A3A17.1080800@roeck-us.net>
Date:	Fri, 23 Oct 2015 06:45:59 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Huang Rui <ray.huang@....com>, 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>,
	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	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>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>
Subject: Re: [PATCH v2 02/10] hwmon: (fam15h_power) Enable power1_input on AMD
 Carrizo

On 10/19/2015 07:28 PM, Huang Rui wrote:
> This patch enables power1_input attribute for Carrizo platform.
>
> Signed-off-by: Huang Rui <ray.huang@....com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> ---
>   drivers/hwmon/fam15h_power.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
> index 41d022e..a090adf 100644
> --- a/drivers/hwmon/fam15h_power.c
> +++ b/drivers/hwmon/fam15h_power.c
> @@ -115,8 +115,11 @@ static int fam15h_power_init_attrs(struct pci_dev *pdev,
>   {
>   	int n = FAM15H_MIN_NUM_ATTRS;
>   	struct attribute **fam15h_power_attrs;
> +	struct cpuinfo_x86 *c = &boot_cpu_data;
>
> -	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model <= 0xf)
> +	if (c->x86 == 0x15 &&
> +	    ((c->x86_model <= 0xf) ||

Please no unnecessary ( ).

> +	     (c->x86_model >= 0x60 && c->x86_model <= 0x6f)))

Those are acceptable to clarify that the && has precedence on purpose,
but "(c->x86_model <= 0xf)" is really unnecessary (and inconsistent
with the rest of the code).

>   		n += 1;
>
>   	fam15h_power_attrs = devm_kcalloc(&pdev->dev, n,
> @@ -128,7 +131,9 @@ static int fam15h_power_init_attrs(struct pci_dev *pdev,
>
>   	n = 0;
>   	fam15h_power_attrs[n++] = &dev_attr_power1_crit.attr;
> -	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model <= 0xf)
> +	if (c->x86 == 0x15 &&
> +	    ((c->x86_model <= 0xf) ||
> +	     (c->x86_model >= 0x60 && c->x86_model <= 0x6f)))

Same here.

>   		fam15h_power_attrs[n++] = &dev_attr_power1_input.attr;
>
>   	data->fam15h_power_group.attrs = fam15h_power_attrs;
>

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