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

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Date: Wed, 12 Jun 2024 16:03:26 +0100
From: Conor Dooley <conor@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>
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 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.


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