linux-hardening - Re: [PATCH v3 08/15] pinctrl: keembay: use a dedicated structure for the pinfunction description

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Message-ID: <CAHp75VdMmfV=z75K9AmB7GsWV8C1bZPLGi33duTCt+CM79spJg@mail.gmail.com>
Date: Thu, 24 Jul 2025 13:11:04 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Alexey Klimov <alexey.klimov@...aro.org>, 
	Lorenzo Bianconi <lorenzo@...nel.org>, Sean Wang <sean.wang@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Paul Cercueil <paul@...pouillou.net>, Kees Cook <kees@...nel.org>, 
	Andy Shevchenko <andy@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...hat.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	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>, NXP S32 Linux Team <s32@....com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Tony Lindgren <tony@...mide.com>, 
	Haojian Zhuang <haojian.zhuang@...aro.org>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org, 
	linux-hardening@...r.kernel.org, linux-mm@...ck.org, imx@...ts.linux.dev, 
	linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 08/15] pinctrl: keembay: use a dedicated structure for
 the pinfunction description

On Thu, Jul 24, 2025 at 11:25 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> struct function_desc is a wrapper around struct pinfunction with an
> additional void *data pointer. We're working towards reducing the usage
> of struct function_desc in pinctrl drivers - they should only be created
> by pinmux core and accessed by drivers using
> pinmux_generic_get_function().

Any link to the discussion and perhaps an updated in-kernel
documentation and/or TODO?

> This driver uses the data pointer so in
> order to stop using struct function_desc, we need to provide an
> alternative that also wraps the mux mode which is passed to pinctrl core
> as user data.

...

> +struct keembay_pinfunction {
> +       struct pinfunction func;
> +       u8 mux_mode;
> +};

My gut's feeling that this type of construction will be in tons of the
drivers, perhaps better to provide an alternative like
struct pinfunction_with_mode {
  ...
};

Or even with variadic arguments... (just saying)

-- 
With Best Regards,
Andy Shevchenko