linux-kernel - Re: [PATCH] drivers: base: add cpu_device

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Date:	Tue, 02 Sep 2014 18:40:21 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Sudeep Holla <sudeep.holla@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Kay Sievers <kay@...y.org>
Subject: Re: [PATCH] drivers: base: add cpu_device_create to support per-cpu
 devices

Hi Greg,

On 02/09/14 18:26, Greg Kroah-Hartman wrote:
> On Tue, Sep 02, 2014 at 06:22:07PM +0100, Sudeep Holla wrote:
>> Hi Greg,
>>
>> On 22/08/14 12:29, Sudeep Holla wrote:
>>> From: Sudeep Holla <sudeep.holla@....com>
>>>
>>> This patch adds a new function to create per-cpu devices.
>>> This helps in:
>>> 1. reusing the device infrastructure to create any cpu related
>>>     attributes and corresponding sysfs instead of creating and
>>>     dealing with raw kobjects directly
>>> 2. retaining the legacy path(/sys/devices/system/cpu/..) to support
>>>     existing sysfs ABI
>>> 3. avoiding to create links in the bus directory pointing to the
>>>     device as there would be per-cpu instance of these devices with
>>>     the same name since dev->bus is not populated to cpu_sysbus on
>>>     purpose
>>>
>>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> ---
>>>   drivers/base/cpu.c  | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>   include/linux/cpu.h |  4 ++++
>>>   2 files changed, 58 insertions(+)
>>>
>>> Hi Greg,
>>>
>>> Here is the alternate solution I could come up with instead of
>>> creating cpu class. cpu_device_create is very similar to
>>> device_create_groups_vargs w/o class support, but I could not
>>> reuse anything else to avoid creating similar function.
>>>
>>> Let me know your thoughts/suggestions on this.
>>>
>>
>> Any feedback on this ? If ok, I will respin cacheinfo series removing
>> cpu class creation with this patch.
>
> Please address the issues others have already raised.
>

If you meant issues raised on cacheinfo series, I have addressed them
already in v3(raised by you, Stephen Boyd, Mark and Russell). I have
retained hotplug notifiers which Stephen wanted to remove as I don't
know if that's acceptable on all the architectures.

I posted this single patch as a replacement to the patch creating cpu
class as Kay and David suggested that we can't have class and bus with
same name.

Regards,
Sudeep

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