linux-kernel - Re: C aggregate passing (Rust kernel policy)

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Message-ID: <f2bf76553c666178505cb9197659303a39faf7aa.camel@HansenPartnership.com>
Date: Wed, 26 Feb 2025 09:26:50 -0500
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Ventura Jack
	 <venturajack85@...il.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, "H. Peter Anvin"
 <hpa@...or.com>, Alice Ryhl <aliceryhl@...gle.com>, Linus Torvalds
 <torvalds@...ux-foundation.org>, Gary Guo <gary@...yguo.net>,
 airlied@...il.com,  boqun.feng@...il.com, david.laight.linux@...il.com,
 ej@...i.de,  gregkh@...uxfoundation.org, hch@...radead.org,
 ksummit@...ts.linux.dev,  linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, Ralf Jung <post@...fj.de>
Subject: Re: C aggregate passing (Rust kernel policy)

On Wed, 2025-02-26 at 14:53 +0100, Miguel Ojeda wrote:
> On Wed, Feb 26, 2025 at 2:03 PM Ventura Jack
> <venturajack85@...il.com> wrote:
[...]
> > Exception/unwind safety may be another subject that increases
> > the difficulty of writing unsafe Rust.
> 
> Note that Rust panics in the kernel do not unwind.

I presume someone is working on this, right?  While rust isn't
pervasive enough yet for this to cause a problem, dumping a backtrace
is one of the key things we need to diagnose how something went wrong,
particularly for user bug reports where they can't seem to bisect.

Regards,

James