linux-kernel - Re: [PATCH v1 1/2] rust: add udelay() function

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Message-ID: <CANiq72n4GKUo3LjNkvBvh0C=20tfz7D_jirZpu+2BogqNuK3KQ@mail.gmail.com>
Date: Tue, 26 Aug 2025 20:03:25 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: a.hindborg@...nel.org, alex.gaynor@...il.com, ojeda@...nel.org, 
	aliceryhl@...gle.com, anna-maria@...utronix.de, bjorn3_gh@...tonmail.com, 
	boqun.feng@...il.com, dakr@...nel.org, frederic@...nel.org, gary@...yguo.net, 
	jstultz@...gle.com, linux-kernel@...r.kernel.org, lossin@...nel.org, 
	lyude@...hat.com, rust-for-linux@...r.kernel.org, sboyd@...nel.org, 
	tglx@...utronix.de, tmgross@...ch.edu, acourbot@...dia.com, 
	daniel.almeida@...labora.com
Subject: Re: [PATCH v1 1/2] rust: add udelay() function

On Tue, Aug 26, 2025 at 1:59 PM FUJITA Tomonori
<fujita.tomonori@...il.com> wrote:
>
> This can lead to an unexpected delay duration, but it's safe in Rust’s
> sense of safety?

If it is just unexpected behavior, then yeah.

Perhaps Andreas is referring to C overflow UB? If that is the case,
then in the kernel it is actually defined due to
`-fno-strict-overflow`.

Cheers,
Miguel