linux-kernel - Re: [PATCH v2 1/9] drivers: base: add new class "cpu" to group cpu devices

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Date:	Fri, 25 Jul 2014 12:09:08 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Sudeep Holla <sudeep.holla@....com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 1/9] drivers: base: add new class "cpu" to group cpu
 devices

On 07/25/14 09:44, Sudeep Holla wrote:
> From: Sudeep Holla <sudeep.holla@....com>
>
> This patch creates a new class called "cpu" and assigns it to all the
> cpu devices. This helps in grouping all the cpu devices and associated
> child devices under the same class.
>
> This patch also:
> 1. modifies the get_parent_device to return the legacy path
>    (/sys/devices/system/cpu/..) for the cpu class devices to support
>    existing sysfs ABI
> 2. avoids creating link in the class directory pointing to the device as
>    there would be per-cpu instance of these devices with the same name
> 3. makes sure subsystem symlink continues pointing to cpu bus instead of
>    cpu class for cpu devices
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Why can't we make a 'cache' bus that the cache devices hang off of? It
doesn't make sense to me why we would want to have cache devices living
on the cpu bus.

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