linux-kernel - Re: [PATCH 2/2] of/fdt: skip unflattening of disabled nodes

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Message-ID: <nycvar.YSQ.7.76.1710051427000.1693@knanqh.ubzr>
Date:   Thu, 5 Oct 2017 14:29:33 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Frank Rowand <frowand.list@...il.com>
cc:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] of/fdt: skip unflattening of disabled nodes

On Tue, 3 Oct 2017, Frank Rowand wrote:

> On 10/03/17 11:46, Nicolas Pitre wrote:
> > On Tue, 3 Oct 2017, Rob Herring wrote:
> > 
> >> For static DT usecases, we don't need the disabled nodes and can skip
> >> unflattening. This saves a significant amount of RAM in memory constrained
> >> cases. In one example on STM32F469, the RAM usage goes from 118K to 26K.
> >>
> >> There are a few cases in the kernel that modify the status property
> >> dynamically. These all are changes from enabled to disabled, depend on
> >> OF_DYNAMIC or are not FDT based (PDT based).
> >>
> >> Cc: Nicolas Pitre <nicolas.pitre@...aro.org>
> >> Cc: Frank Rowand <frowand.list@...il.com>
> >> Signed-off-by: Rob Herring <robh@...nel.org>
> > 
> > Tested-by: Nicolas Pitre <nico@...aro.org>
> > 
> >> ---
> >> For more background, see this presentation from Nico:
> >>
> >> https://connect.linaro.org/resource/sfo17/sfo17-100/
> > 
> > Oh my ... this is horrible ...
> 
> I found the presentation to be quite good and useful.

Thanks. I think the content is good. I'm just a terrible speaker.

> The Linaro site does not have the slides, could you please send
> me a copy?

I've asked for the slides to be uploaded to the site. I've sent you a 
copy privately in the mean time.


Nicolas