linux-kernel - Re: [PATCH v4 4/7] rust: time: Add wrapper for fsleep function

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Message-ID: <87cyjj2vi1.ffs@tglx>
Date: Tue, 29 Oct 2024 08:55:50 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: FUJITA Tomonori <fujita.tomonori@...il.com>, boqun.feng@...il.com
Cc: fujita.tomonori@...il.com, anna-maria@...utronix.de,
 frederic@...nel.org, jstultz@...gle.com, sboyd@...nel.org,
 linux-kernel@...r.kernel.org, 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, aliceryhl@...gle.com, arnd@...db.de
Subject: Re: [PATCH v4 4/7] rust: time: Add wrapper for fsleep function

On Tue, Oct 29 2024 at 08:30, FUJITA Tomonori wrote:
> On Sun, 27 Oct 2024 21:38:41 -0700
> Boqun Feng <boqun.feng@...il.com> wrote:
>> That also works for me, but an immediate question is: do we put
>> #[must_use] on `fsleep()` to enforce the use of the return value? If
>> yes, then the normal users would need to explicitly ignore the return
>> value:
>> 
>> 	let _ = fsleep(1sec);
>> 
>> The "let _ =" would be a bit annoying for every user that just uses a
>> constant duration.
>
> Yeah, but I don't think that we have enough of an excuse here to break
> the rule "Do not crash the kernel".
>
> Another possible option is to convert an invalid argument to a safe
> value (e.g., the maximum), possibly with WARN_ON_ONCE().

That makes sense.