linux-kernel - Re: [PATCH] kobject: Add support for default attribute groups to kobj

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Message-ID: <20190324034821.GA47676@ubu-Virtual-Machine>
Date:   Sat, 23 Mar 2019 23:48:21 -0400
From:   Kimberly Brown <kimbrownkd@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kobject: Add support for default attribute groups to
 kobj_type

On Sat, Mar 23, 2019 at 07:07:37AM +0100, Greg Kroah-Hartman wrote:
> On Fri, Mar 22, 2019 at 04:14:40PM -0400, Kimberly Brown wrote:
> > kobj_type currently uses a list of individual attributes to store
> > default attributes. Attribute groups are more flexible than a list of
> > attributes because groups provide support for attribute visibility. So,
> > add support for default attribute groups to kobj_type.
> > 
> > In future patches, the existing uses of kobj_type’s attribute list will
> > be converted to attribute groups. When that is complete, kobj_type’s
> > attribute list, “default_attrs”, will be removed.
> > 
> > Signed-off-by: Kimberly Brown <kimbrownkd@...il.com>
> > ---
> >  include/linux/kobject.h |  3 ++-
> >  lib/kobject.c           | 14 ++++++++++++++
> >  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> Yes!  Thanks for doing this.
> 
> But how did you test it?  Did you convert any kobj_type structures to
> the attribute group and see that all was the same?  Ideally I'd like to
> take this patch with at least one subsystem that uses the change,
> otherwise this looks like unused code in the kernel.

Yes, I tested it by converting a couple of kobj_type structures,
including one that I recently added an is_visible() function to
(vmbus_chan_ktype in the hv_vmbus driver).

I'll put together a patchset with this patch and at least one
subsystem's changes.

Thanks,
Kim

> 
> thanks,
> 
> greg k-h