linux-kernel - Re: [PATCH v2 00/20] pinctrl: Use scope based of_node

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Date: Thu, 30 May 2024 13:56:54 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, Dvorkin Dmitry <dvorkin@...bo.com>, Wells Lu <wellslutw@...il.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Emil Renner Berthing <kernel@...il.dk>, Jianlong Huang <jianlong.huang@...rfivetech.com>, 
	Hal Feng <hal.feng@...rfivetech.com>, Orson Zhai <orsonzhai@...il.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, Chunyan Zhang <zhang.lyra@...il.com>, 
	Viresh Kumar <vireshk@...nel.org>, Shiraz Hashim <shiraz.linux.kernel@...il.com>, soc@...nel.org, 
	Krzysztof Kozlowski <krzk@...nel.org>, Sylwester Nawrocki <s.nawrocki@...sung.com>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Patrice Chotard <patrice.chotard@...s.st.com>, Heiko Stuebner <heiko@...ech.de>, 
	Damien Le Moal <dlemoal@...nel.org>, Ludovic Desroches <ludovic.desroches@...rochip.com>, 
	Nicolas Ferre <nicolas.ferre@...rochip.com>, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, Claudiu Beznea <claudiu.beznea@...on.dev>, 
	Dong Aisheng <aisheng.dong@....com>, Fabio Estevam <festevam@...il.com>, 
	Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Chester Lin <chester62515@...il.com>, 
	Matthias Brugger <mbrugger@...e.com>, Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>, 
	Sean Wang <sean.wang@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Andrew Jeffery <andrew@...econstruct.com.au>, 
	Joel Stanley <joel@....id.au>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Tony Lindgren <tony@...mide.com>, Stephen Warren <swarren@...dotorg.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, 
	linux-stm32@...md-mailman.stormreply.com, linux-samsung-soc@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
	imx@...ts.linux.dev, linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org, 
	Peng Fan <peng.fan@....com>, 
	Emil Renner Berthing <emil.renner.berthing@...onical.com>
Subject: Re: [PATCH v2 00/20] pinctrl: Use scope based of_node_put() cleanups

Hi Peng,

On Sat, May 4, 2024 at 3:12 PM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
> Use scope based of_node_put() to simplify code. It reduces the chance
> of forgetting of_node_put(), and also simplifies error handling path.
> I not able to test the changes on all the hardwares, so driver owners,
> please help review when you have time.
>
> This patchset was inspired from Dan's comments on pinctrl-scmi-imx.c,
> thanks.
>
> Signed-off-by: Peng Fan <peng.fan@....com>

Andy's question about code generation on a related patch made me
wonder, too.

On arm32, a conversion to for_each_child_of_node_scoped() seems to
cost ca. 48 bytes of additional code, regardless of whether there were
explicit cleanups before or not.

I checked "pinctrl: renesas: Use scope based of_node_put() cleanups",
and all but the conversions in *_dt_node_to_map() cost 48 bytes each.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds