linux-kernel - Re: [PATCH 3/3] arm64: cpuinfo: display product info in /proc/cpuinfo

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Message-ID: <d186c3fa-5d6f-8865-b824-efcdc7184cb3@gmail.com>
Date:   Tue, 26 Sep 2017 17:40:20 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Al Stone <ahs3@...hat.com>, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH 3/3] arm64: cpuinfo: display product info in /proc/cpuinfo

On 09/26/2017 03:23 PM, Al Stone wrote:
> While it is very useful to know what CPU is being used, it is also
> useful to know who made the platform being used.  On servers, this
> can point to the right person to contact when a server is having
> trouble.
> 
> Go get the product info -- manufacturer, product name and version --
> from DMI (aka SMBIOS) and display it in /proc/cpuinfo.  To look more
> like other server platforms, include the CPU type and frequency when
> displaying the product info, too.
> 
> Signed-off-by: Al Stone <ahs3@...hat.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> ---

[snip]

> +/* Look up the baseboard info in DMI */
> +static void get_dmi_product_info(void)
> +{
> +	if (!dmi_product_info) {
> +		dmi_product_info = kcalloc(DMI_MAX_STRLEN,
> +					   sizeof(char), GFP_KERNEL);
> +		if (!dmi_product_info)
> +			return;
> +	}
> +
> +	dmi_walk(find_dmi_product_info, dmi_product_info);
> +}

Don't you need all of these DMI-related functions you defined to be also
enclosed within an #if IS_ENABLED(CONFIG_DMI) otherwise chances are that
we are going to get defined but unused warnings?


>  		impl = (u8) MIDR_IMPLEMENTOR(midr);
>  		for (j = 0; hw_implementer[j].id != 0; j++) {
>  			if (hw_implementer[j].id == impl) {
> @@ -208,7 +341,7 @@ static int c_show(struct seq_file *m, void *v)
>  		part = (u16) MIDR_PARTNUM(midr);
>  		for (j = 0; parts[j].id != (-1); j++) {
>  			if (parts[j].id == part) {
> -				seq_printf(m, "%s\n", parts[j].name);
> +				seq_printf(m, "%s ", parts[j].name);
>  				break;
>  			}

Should this hunk be part of patch 3?
-- 
Florian