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

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Message-ID: <20240810210359.GD11646@noisy.programming.kicks-ass.net>
Date: Sat, 10 Aug 2024 23:03:59 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Alice Ryhl <aliceryhl@...gle.com>
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>,
	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, Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
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	"H. Peter Anvin" <hpa@...or.com>,
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	Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
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	linux-arm-kernel@...ts.infradead.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
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	Andrew Jones <ajones@...tanamicro.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	linux-riscv@...ts.infradead.org,
	Huacai Chen <chenhuacai@...nel.org>,
	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 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.

> +// 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)* )
> +    };
> +}