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

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Message-ID: <20250227163319.5b19a68a@gandalf.local.home>
Date: Thu, 27 Feb 2025 16:33:19 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: David Laight <david.laight.linux@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Martin Uecker
 <uecker@...raz.at>, Ralf Jung <post@...fj.de>, "Paul E. McKenney"
 <paulmck@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Ventura Jack
 <venturajack85@...il.com>, Kent Overstreet <kent.overstreet@...ux.dev>,
 Gary Guo <gary@...yguo.net>, airlied@...il.com, boqun.feng@...il.com,
 ej@...i.de, gregkh@...uxfoundation.org, hch@...radead.org, hpa@...or.com,
 ksummit@...ts.linux.dev, linux-kernel@...r.kernel.org,
 miguel.ojeda.sandonis@...il.com, rust-for-linux@...r.kernel.org
Subject: Re: C aggregate passing (Rust kernel policy)

On Thu, 27 Feb 2025 20:47:22 +0000
David Laight <david.laight.linux@...il.com> wrote:

> Except that (IIRC) it is actually valid for the compiler to write something
> entirely unrelated to a memory location before writing the expected value.
> (eg use it instead of stack for a register spill+reload.)
> Not gcc doesn't do that - but the standard lets it do it.

I call that a bug in the specification ;-)

-- Steve