linux-kernel - Re: [PATCH v3 0/4] rust: extend `module!` macro with integer parameter support

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Message-ID: <CAH5fLgh+iOefU3vG=e8aAFhcKh0W=6M0odUt3s_wfDKW+rGNOg@mail.gmail.com>
Date: Fri, 13 Dec 2024 13:48:25 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: Greg KH <gregkh@...uxfoundation.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Masahiro Yamada <masahiroy@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, Trevor Gross <tmgross@...ch.edu>, 
	Adam Bratschi-Kaye <ark.email@...il.com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v3 0/4] rust: extend `module!` macro with integer
 parameter support

On Fri, Dec 13, 2024 at 1:24 PM Andreas Hindborg <a.hindborg@...nel.org> wrote:
>
> "Greg KH" <gregkh@...uxfoundation.org> writes:
>
> > On Fri, Dec 13, 2024 at 12:30:45PM +0100, Andreas Hindborg wrote:
> >> This series extends the `module!` macro with support module parameters.
> >
> > Eeek, why?
> >
> > Module parameters are from the 1990's, back when we had no idea what we
> > were doing and thought that a simple "one variable for a driver that
> > controls multiple devices" was somehow a valid solution :)
> >
> > Please only really add module parameters if you can prove that you
> > actually need a module parameter.
>
> I really need module parameters to make rust null block feature
> compatible with C null block.

Instead of providing module parameters to Rust code, you could
implement that part of Rust nullblk in C. That way, you discourage
future Rust drivers from using module parameters without making it
impossible to have them in Rust nullblk.

Alice