linux-kernel - Re: [PATCH v3 2/2] rust: Add read_poll_timeout

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Message-ID: <aQCTXFcSyCxJ8KqD@google.com>
Date: Tue, 28 Oct 2025 09:56:44 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: a.hindborg@...nel.org, alex.gaynor@...il.com, dakr@...nel.org, 
	daniel.almeida@...labora.com, ojeda@...nel.org, anna-maria@...utronix.de, 
	bjorn3_gh@...tonmail.com, boqun.feng@...il.com, 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
Subject: Re: [PATCH v3 2/2] rust: Add read_poll_timeout_atomic function

On Sun, Oct 26, 2025 at 09:54:58PM +0900, FUJITA Tomonori wrote:
> Add read_poll_timeout_atomic function which polls periodically until a
> condition is met, an error occurs, or the attempt limit is reached.
> 
> The C's read_poll_timeout_atomic() is used for the similar purpose.
> In atomic context the timekeeping infrastructure is unavailable, so
> reliable time-based timeouts cannot be implemented. So instead, the
> helper accepts a maximum number of attempts and busy-waits (udelay +
> cpu_relax) between tries.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>