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Message-ID: <ZWipTZysC2YL7qsq@Boquns-Mac-mini.home>
Date: Thu, 30 Nov 2023 07:25:01 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
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 11:42:26AM +0100, Peter Zijlstra wrote:
> On Wed, Nov 29, 2023 at 09:08:14AM -0800, Boqun Feng wrote:
>
> > But but but, I then realized we have asm goto in C but Rust doesn't
> > support them, and I haven't thought through how hard tht would be..
>
> You're kidding right?
>
I'm not, but I've found this:
https://github.com/Amanieu/rfcs/blob/inline-asm/text/0000-inline-asm.md#asm-goto
seems to me, the plan for this is something like below:
asm!(
"cmp {}, 42",
"jeq {}",
in(reg) val,
label { println!("a"); },
fallthrough { println!("b"); }
);
But it's not implemented yet. Cc Josh in case that he knows more about
this.
Regards,
Boqun
> I thought we *finally* deprecated all compilers that didn't support
> asm-goto and x86 now mandates asm-goto to build, and then this toy
> language comes around ?
>
> What a load of crap ...
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