linux-kernel - Re: [RFC PATCH 0/2] Sysfs group create for empty groups.

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Message-ID: <20110823003352.GA5982@kroah.com>
Date:	Mon, 22 Aug 2011 17:33:52 -0700
From:	Greg KH <greg@...ah.com>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] Sysfs group create for empty groups.

On Wed, Aug 17, 2011 at 05:27:41PM +0100, Jonathan Cameron wrote:
> On 08/17/11 11:17, Jonathan Cameron wrote:
> > The following is a quick stab at avoiding a hideous work around
> > we are currently using in IIO.  In some cases we have entire
> > attribute groups that are created from descriptions an array
> > of struct iio_chan_spec.  To keep the reference counts sane
> > and cause subdirectories to be created we are currently using
> > dummy groups and dummy attribute arrays (provided once in the
> > core).  This series is an initial probably stupid approach
> > to avoiding this.
> > 
> > Greg has expressed some doubts about whether subdirectories are
> > ever a good idea, but the problem occurs for the top level
> > directory as well (handled by patch 1).
> > 
> > Note, all attributes are created at probe time.  Ultimately we
> > are just respinning the create_group code to allow us to create
> > the attributes from a device description rather than statically
> > allocating them in each driver (results in a massive reduction
> > in repeated code).
> > 
> > All opinions welcomed.
> > 
> > (this is definitely an rfc, the code isn't even tested yet)
> Now tested and looks fine, so I've pushed it to our iio dev tree
> (which is re based a few times a day currently so I can always
> drop it again ;)

Can you show me how you would use this so I could try to understand it a
bit better?

confused,

greg k-h
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