linux-kernel - Re: [PATCH v2 1/2] rust: add static_key

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Message-ID: <CAH5fLgg2v1jL8uFBK3mEMW-mPydBj1eRT6je8YGtHyNF48JCfA@mail.gmail.com>
Date: Fri, 21 Jun 2024 12:38:21 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Conor Dooley <conor@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Jason Baron <jbaron@...mai.com>, 
	Ard Biesheuvel <ardb@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...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>, Andreas Hindborg <a.hindborg@...sung.com>, 
	linux-trace-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] rust: add static_key_false

On Wed, Jun 12, 2024 at 5:03 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Mon, Jun 10, 2024 at 02:01:04PM +0000, Alice Ryhl wrote:
> > Add just enough support for static key so that we can use it from
> > tracepoints. Tracepoints rely on `static_key_false` even though it is
> > deprecated, so we add the same functionality to Rust.
> >
> > It is not possible to use the existing C implementation of
> > arch_static_branch because it passes the argument `key` to inline
> > assembly as an 'i' parameter, so any attempt to add a C helper for this
> > function will fail to compile because the value of `key` must be known
> > at compile-time.
> >
> > Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
>
> > +#[cfg(target_arch = "x86_64")]
>
> > +#[cfg(target_arch = "aarch64")]
>
> This patch breaks the build on riscv (and I assume loongarch):
>
> error[E0432]: unresolved import `_static_key_false`
> --> /stuff/linux/rust/kernel/static_key.rs:87:10
> |
> 87 | pub use {_static_key_false, static_key_false};
> |          ^^^^^^^^^^^^^^^^^ no external crate `_static_key_false`
>
> Cheers,
> Conor.

Thank you. Fixed in v3.
https://lore.kernel.org/all/20240621-tracepoint-v3-0-9e44eeea2b85@google.com/

Alice