linux-kernel - Re: [PATCH 2/2 v3] drivers: use __free attribute instead of of_node

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Date: Wed, 1 May 2024 15:06:19 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Vincenzo Mezzela <vincenzo.mezzela@...il.com>
Cc: sudeep.holla@....com, javier.carrasco.cruz@...il.com,
	julia.lawall@...ia.fr, linux-kernel@...r.kernel.org,
	rafael@...nel.org, skhan@...uxfoundation.org
Subject: Re: [PATCH 2/2 v3] drivers: use __free attribute instead of
 of_node_put()

On Wed, May 01, 2024 at 02:33:39PM +0200, Vincenzo Mezzela wrote:
> On 01/05/24 12:48, Greg KH wrote:
> > On Wed, May 01, 2024 at 11:43:13AM +0200, Vincenzo Mezzela wrote:
> > > Introduce the __free attribute for scope-based resource management.
> > > Resources allocated with __free are automatically released at the end of
> > > the scope. This enhancement aims to mitigate memory management issues
> > > associated with forgetting to release resources by utilizing __free
> > > instead of of_node_put().
> > > 
> > > The declaration of the device_node used within the do-while loops is
> > > moved directly within the loop so that the resource is automatically
> > > freed at the end of each iteration.
> > > 
> > > Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
> > > Signed-off-by: Vincenzo Mezzela <vincenzo.mezzela@...il.com>
> > > ---
> > >   drivers/base/arch_topology.c | 51 +++++++++++++++---------------------
> > >   1 file changed, 21 insertions(+), 30 deletions(-)
> > How was all of this tested?
> > 
> > thanks,
> > 
> > greg k-h
> 
> Hi,
> 
> I just cross-compiled it for RISC-V to enable the config
> GENERIC_ARCH_TOPOLOGY
> and include arch_topology.c as well.

Cross-compile is nice, how about running it?

> Do you have any suggestion to trigger the affected code and perform some
> testing?

That is up to you to determine if you wish to modify it :)

thanks,

greg k-h