linux-kernel - Re: [PATCH v6 5/5] rust: add arch_static

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Message-ID: <CAH5fLggwLOhP_6b==dc73uJCUBcu2fNQ7SCnqovv2hVXFtUHEQ@mail.gmail.com>
Date: Sat, 10 Aug 2024 23:44:13 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 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>, 
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	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, Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org, 
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	WANG Xuerui <kernel@...0n.name>, Bibo Mao <maobibo@...ngson.cn>, 
	Tiezhu Yang <yangtiezhu@...ngson.cn>, Andrew Morton <akpm@...ux-foundation.org>, 
	Tianrui Zhao <zhaotianrui@...ngson.cn>, loongarch@...ts.linux.dev
Subject: Re: [PATCH v6 5/5] rust: add arch_static_branch

On Sat, Aug 10, 2024 at 11:04 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Aug 08, 2024 at 05:23:41PM +0000, Alice Ryhl wrote:
>
> > +/// Wrapper around `asm!` that uses at&t syntax on x86.
> > +// Uses a semicolon to avoid parsing ambiguities, even though this does not match native `asm!`
> > +// syntax.
> > +#[cfg(target_arch = "x86_64")]
> > +#[macro_export]
> > +macro_rules! asm {
> > +    ($($asm:expr),* ; $($rest:tt)*) => {
> > +        ::core::arch::asm!( $($asm)*, options(att_syntax), $($rest)* )
> > +    };
> > +}
> > +
> > +/// Wrapper around `asm!` that uses at&t syntax on x86.
>
> ^ the above line seems out of place given the 'not' below.

Comments with three slashes are what gets rendered in the html version
of the docs [1]. This way, the rendered docs will say that the `asm!`
macro is a wrapper around the built-in `asm!` that uses at&t syntax on
x86 regardless of which platform you build the docs on.

[1]: https://rust.docs.kernel.org/kernel/

> > +// For non-x86 arches we just pass through to `asm!`.
> > +#[cfg(not(target_arch = "x86_64"))]
>          ^^^
> > +#[macro_export]
> > +macro_rules! asm {
> > +    ($($asm:expr),* ; $($rest:tt)*) => {
> > +        ::core::arch::asm!( $($asm)*, $($rest)* )
> > +    };
> > +}