linux-kernel - Re: [PATCH 1/7] rust: file: add Rust abstraction for `struct file`

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Message-ID: <20231201090039.GF3818@noisy.programming.kicks-ass.net>
Date:   Fri, 1 Dec 2023 10:00:39 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...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>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Carlos Llamas <cmllamas@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH 1/7] rust: file: add Rust abstraction for `struct file`

On Thu, Nov 30, 2023 at 07:25:01AM -0800, Boqun Feng wrote:

> seems to me, the plan for this is something like below:
> 
> 	asm!(
> 		"cmp {}, 42",
> 		"jeq {}",
> 		in(reg) val,
> 		label { println!("a"); },
> 		fallthrough { println!("b"); }
>     	);

Because rust has horrible syntax I can't parse, I can't tell if this is
useful or not :/ Can this be used to implement arch_static_branch*() ?