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

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Message-ID: <e08ce8e2-a44a-425a-aef7-b9fd046970aa@lunn.ch>
Date: Fri, 18 Oct 2024 16:05:28 +0200
From: Andrew Lunn <andrew@...n.ch>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, rust-for-linux@...r.kernel.org,
	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,
	aliceryhl@...gle.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

> +/// This function can only be used in a nonatomic context.
> +pub fn fsleep(delta: time::Delta) {
> +    // SAFETY: FFI call.
> +    unsafe {
> +        // Convert the duration to microseconds and round up to preserve
> +        // the guarantee; fsleep sleeps for at least the provided duration,
> +        // but that it may sleep for longer under some circumstances.
> +        bindings::fsleep(
> +            ((delta.as_nanos() + time::NSEC_PER_USEC - 1) / time::NSEC_PER_USEC) as c_ulong,

You add a as_sec() helper, but then don't use it? If the helper does
not do what you want, maybe the helper is wrong? This is part of why
we say all APIs should have a user.

	Andrew