linux-kernel - Re: [PATCH v9 01/13] rust: hrtimer: introduce hrtimer support

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Message-ID: <Z7ye0MsACNWe7Mbr@Mac.home>
Date: Mon, 24 Feb 2025 08:31:12 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Andreas Hindborg <a.hindborg@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Danilo Krummrich <dakr@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Lyude Paul <lyude@...hat.com>, Guangbo Cui <2407018371@...com>,
	Dirk Behme <dirk.behme@...il.com>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Tamir Duberstein <tamird@...il.com>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>
Subject: Re: [PATCH v9 01/13] rust: hrtimer: introduce hrtimer support

On Mon, Feb 24, 2025 at 05:23:59PM +0100, Miguel Ojeda wrote:
> On Mon, Feb 24, 2025 at 4:46 PM Boqun Feng <boqun.feng@...il.com> wrote:
> >
> > Why do we need this new kconfig?
> 
> I suspect it is to provide flexibility (i.e. to avoid building
> everything if there are no users of the abstraction) and/or to limit
> the set of configs that may be affected by a breaking change on the C
> side -- Andreas and I discussed it the other day. The description of
> the issue has some lines, but perhaps the commit message could

Do you have a link to the issue?

I asked because hrtimer API is always available regardless of the
configuration, and it's such a core API, so it should always be there
(Rust or C).

Regards,
Boqun

> clarify.
> 
> We have a similar one already, i.e. a "Rust-only" config, in
> `CONFIG_RUST_FW_LOADER_ABSTRACTIONS`.
> 
> Since this one is default "y", it may still affect unrelated
> subsystems that just enable `RUST=y`, though.
> 
> (I guess we could consider `select`ing from end users. But they cannot
> be hidden symbols, because that limits the control too much (e.g.
> someone may want to just build the abstraction), and in general they
> may have dependencies, so it may not be a good idea.)
> 
> Cheers,
> Miguel