linux-kernel - Re: [PATCH 34/54] Driver Core: add kobj

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Date:	Mon, 05 Nov 2007 17:23:32 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 34/54] Driver Core: add kobj_attribute handling

On Mon, 2007-11-05 at 13:42 +0100, Cornelia Huck wrote:
> On Fri,  2 Nov 2007 16:59:12 -0700,
> Greg Kroah-Hartman <gregkh@...e.de> wrote:
> 
> > From: Kay Sievers <kay.sievers@...y.org>
> > 
> > Add kobj_sysfs_ops to replace subsys_sysfs_ops. There is no
> > need for special kset operations, we want to be able to use
> > simple attribute operations at any kobject, not only ksets.
> > 
> > The whole concept of any default sysfs attribute operations
> > will go away with the upcoming removal of subsys_sysfs_ops.
> > 
> > Signed-off-by: Kay Sievers <kay.sievers@...y.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> > ---
> >  include/linux/kobject.h |   10 ++++++++++
> >  lib/kobject.c           |   29 +++++++++++++++++++++++++++++
> >  2 files changed, 39 insertions(+), 0 deletions(-)
> 
> How about adding some simple wrappers around the new kobj_attribute
> structure? This makes the layering clearer.

> +#define KOBJ_ATTR(_name,_mode,_show,_store)		\
> +	struct kobj_attribute kobj_attr_##_name =	\
> +		__ATTR(_name,_mode,_show,_store)

That sounds fine.

> +extern int __must_check kobject_create_file(struct kobject *,
> 
> 					    struct kobj_attribute *);
> +extern void kobject_remove_file(struct kobject *,struct kobj_attribute *);

That should usually be done by default attributes assigned to the ktype.
Do you have a good use case, where people need to create such attributes
individually instead?

Kay

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