linux-kernel - Re: [PATCH] driver core: Move driver

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Message-ID: <20140410095014.3dc234ea@endymion.delvare>
Date:	Thu, 10 Apr 2014 09:50:14 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] driver core: Move driver_data back to struct device

Hi Greg,

On Mon, 7 Apr 2014 13:58:15 -0700, Greg Kroah-Hartman wrote:
> On Mon, Apr 07, 2014 at 10:53:22AM +0200, Jean Delvare wrote:
> > Having to allocate memory as part of dev_set_drvdata() is a problem
> > because that memory may never get freed if the device itself is not
> > created. So move driver_data back to struct device.
> > 
> > This is a partial revert of commit b4028437.
> > 
> > Signed-off-by: Jean Delvare <jdelvare@...e.de>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> > Greg, we discussed that back in January (in a thread named "Freeing of
> > dev->p") but I did not hear back from you and I can't see this fix in
> > your driver-core tree.
> 
> Thanks for doing this, I'll queue this up after -rc1 is out.  I still
> have that thread in my TODO list, unfortunatly, higher-priority items
> keep bumping it down :(

No problem, I understand.

Meanwhile I have prepared a patch set with all the cleanups that could
go in after that one, basically reverting all of commit b4028437 step
by step. If you want to take a look, it's at:
  http://jdelvare.nerim.net/devel/linux-3/driver-core/

FWIW the full patch set shaves about 1.2 MB off an allmodconfig x86_64
build. And it certainly comes with some performance gains too.

I can post the whole set now if you want, I just did not want to throw
too much at you if you are already swamped.

Also, I can merge some of these patches together if you think I went
too fine-grained.

Thanks,
-- 
Jean Delvare
SUSE L3 Support
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