linux-kernel - Re: [PATCH 00/28] iio: zero init stack with { } instead of memset()

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Message-ID: <aEsmDyc44P8amm5p@smile.fi.intel.com>
Date: Thu, 12 Jun 2025 22:10:07 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Pavel Machek <pavel@....cz>
Cc: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
	David Lechner <dlechner@...libre.com>,
	linux-rockchip@...ts.infradead.org,
	Michael Hennerich <michael.hennerich@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Francesco Dolcini <francesco@...cini.it>,
	João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>,
	Leonard Göhrs <l.goehrs@...gutronix.de>,
	kernel@...gutronix.de, Oleksij Rempel <o.rempel@...gutronix.de>,
	Roan van Dijk <roan@...tonic.nl>,
	Tomasz Duszynski <tomasz.duszynski@...akon.com>,
	Jacopo Mondi <jacopo@...ndi.org>,
	Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>,
	Mudit Sharma <muditsharma.info@...il.com>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Ondřej Jirman <megi@....cz>,
	Andreas Klinger <ak@...klinger.de>,
	Petre Rodan <petre.rodan@...dimension.ro>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 00/28] iio: zero init stack with { } instead of memset()

On Thu, Jun 12, 2025 at 08:54:07PM +0200, Pavel Machek wrote:
> > On Thursday, 12 June 2025 11:17:52 Central European Summer Time Pavel Machek wrote:
> > > 
> > > > Jonathan mentioned recently that he would like to get away from using
> > > > memset() to zero-initialize stack memory in the IIO subsystem. And we
> > > > have it on good authority that initializing a struct or array with = { }
> > > > is the preferred way to do this in the kernel [1]. So here is a series
> > > > to take care of that.
> > > 
> > > 1) Is it worth the churn?
> > > 
> > > 2) Will this fail to initialize padding with some obscure compiler?
> > 
> > as of right now, the only two C compilers that are supported are
> > GCC >= 8.1, and Clang >= 13.0.1. If anyone even manages to get the
> > kernel
> 
> Well... I'm pretty sure parts of this would make it into -stable as a
> dependency, or because AUTOSEL decides it is a bugfix. So..
> 
> GNU C                  4.9              gcc --version
> Clang/LLVM (optional)  10.0.1           clang --version

Even though, what the kernel versions are you referring to? I am sure there
plenty of cases with {} there.

-- 
With Best Regards,
Andy Shevchenko