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

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Message-ID: <5405FCBF.2050100@arm.com>
Date:	Tue, 02 Sep 2014 18:22:07 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Sudeep Holla <Sudeep.Holla@....com>,
	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 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.

Regards,
Sudeep

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