netdev - Re: [PATCH net-next v3 5/8] rust: time: Add wrapper for fsleep function

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Message-ID: <CANiq72mKJuCdB2kCwBj5M04bw2O+7L9=yPiGJQeyMjWEsCxAMA@mail.gmail.com>
Date: Wed, 16 Oct 2024 11:42:07 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, netdev@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, andrew@...n.ch, hkallweit1@...il.com, 
	tmgross@...ch.edu, ojeda@...nel.org, alex.gaynor@...il.com, gary@...yguo.net, 
	bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, a.hindborg@...sung.com, 
	anna-maria@...utronix.de, frederic@...nel.org, tglx@...utronix.de, 
	arnd@...db.de, jstultz@...gle.com, sboyd@...nel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 5/8] rust: time: Add wrapper for fsleep function

On Wed, Oct 16, 2024 at 10:29 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> You probably want this:
>
> delta.as_nanos().saturating_add(time::NSEC_PER_USEC - 1) / time::NSEC_PER_USEC
>
> This would avoid a crash if someone passes i64::MAX nanoseconds and
> CONFIG_RUST_OVERFLOW_CHECKS is enabled.

I think we should document whether `fsleep` is expected to be usable
for "forever" values.

It sounds like that, given "too large" values in `msecs_to_jiffies`
mean "infinite timeout".

Cheers,
Miguel