linux-kernel - Re: [PATCH v2 7/8] [PATCH 7/8] drivers/hwmon: Add a generic PECI hwmon client driver

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Date:   Sat, 24 Feb 2018 01:32:53 -0800
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Guenter Roeck <linux@...ck-us.net>,
        joel@....id.au, andrew@...id.au, Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>, jdelvare@...e.com,
        benh@...nel.crashing.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v2 7/8] [PATCH 7/8] drivers/hwmon: Add a generic PECI
 hwmon client driver

On 2/23/2018 4:00 PM, Miguel Ojeda wrote:
> On Thu, Feb 22, 2018 at 2:29 AM, Jae Hyun Yoo
> <jae.hyun.yoo@...ux.intel.com> wrote:
>> On 2/21/2018 4:37 PM, Andrew Lunn wrote:
>>>>
>>>> But even with this change, it still needs to use delayed creation
>>>> because BMC side kernel doesn't know how many DIMMs are populated on
>>>> a remote server before the remote server completes its memory
>>>> training and testing in BIOS, but it needs to check the remote
>>>> server's CPU temperature as immediate as possible to make
>>>> appropriate thermal control based on the remote CPU's temperature to
>>>> avoid any critical thermal issue. What would be a better solution in
>>>> this case?
>>>
>>>
>>> You could change this driver so that it supports one DIMM.  Move the
>>> 'hotplug' part into another driver which creates and destroys
>>> instances of the hwmon DIMM device as the DIMMS come and go.
>>>
>>> Also, do you need to handle CPU hotplug? You could split the CPU
>>> temperature part into a separate hwmon driver? And again create and
>>> destroy devices as CPUs come and go?
>>>
>>>          Andrew
>>>
>>
>> That seems like a possible option. I'll rewrite the hwmon driver again like
>> that.
>>
>> Thanks for the good idea. :)
> 
> By the way, in the rewrite, please try to avoid the create*workqueue()
> functions (they are deprecated :).
> 
> Cheers,
> Miguel
> 

Hi Miguel,

Thanks for letting me know that. I'll replace that with 
alloc_workqueue(). :)

Regards,
Jae

>>
>> Jae