linux-kernel - Re: [RFC PATCH 0/5] Rust block device driver API and null block driver

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Date: Thu, 14 Mar 2024 17:16:10 +0000
From: Conor Dooley <conor@...nel.org>
To: Bart Van Assche <bvanassche@....org>
Cc: Philipp Stanner <pstanner@...hat.com>,
	Andreas Hindborg <nmi@...aspace.dk>, Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...nel.org>,
	Damien Le Moal <Damien.LeMoal@....com>,
	Hannes Reinecke <hare@...e.de>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Niklas Cassel <Niklas.Cassel@....com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Chaitanya Kulkarni <chaitanyak@...dia.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Yexuan Yang <1182282462@...t.edu.cn>,
	Sergio González Collado <sergio.collado@...il.com>,
	Joel Granados <j.granados@...sung.com>,
	"Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	open list <linux-kernel@...r.kernel.org>,
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" <lsf-pc@...ts.linux-foundation.org>,
	"gost.dev@...sung.com" <gost.dev@...sung.com>
Subject: Re: [RFC PATCH 0/5] Rust block device driver API and null block
 driver

Just a passer-by here, but I noticed the link to Laurent's talk..

On Thu, Mar 14, 2024 at 10:03:28AM -0700, Bart Van Assche wrote:
> On 3/14/24 05:14, Philipp Stanner wrote:
> 
> > The Kernel's C already has more memory safety than standardized C:
> > There's devres, and since last year there's the __cleanup attribute.
> > – but the thing is, you can just ignore it and do it the old way.
> 
> devres is controversial - see also Laurent Pinchart, "Why is
> devm_kzalloc() harmful and what can we do about it", LPC, 2022
> (https://lpc.events/event/16/contributions/1227/).

I don't think that's a great thing to cite, that talk prompted a series
of others with (AFAIK*) the most recent being from Bart at LPC this year:
https://lpc.events/event/17/contributions/16f
The TL;DR is that it's not actually problem caused by devres.

* I think Wolfram also talked about it at an automotive conference, but
  that seemed like a bit of a pitch for funding from the safety
  conscious 


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