linux-kernel - Re: [PATCH 4/5] rust: percpu: Add pin-hole optimizations for numerics

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Message-ID: <d938ed3a-cb00-0a71-2380-dac7d1a9e039@gentwo.org>
Date: Wed, 25 Jun 2025 10:23:42 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Mitchell Levy <levymitchell0@...il.com>
cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
    Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
    Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
    Andreas Hindborg <a.hindborg@...nel.org>, 
    Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
    Andrew Morton <akpm@...ux-foundation.org>, Dennis Zhou <dennis@...nel.org>, 
    Tejun Heo <tj@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
    Benno Lossin <lossin@...nel.org>, linux-kernel@...r.kernel.org, 
    rust-for-linux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/5] rust: percpu: Add pin-hole optimizations for
 numerics

On Tue, 24 Jun 2025, Mitchell Levy wrote:

> +                        concat!("add gs:[{off}], {val:", $reg, "}"),

> +                        concat!("sub gs:[{off}], {val:", $reg, "}"),

> +                        concat!("sub gs:[{off}], {val}"),

Where are the other RMV instructions like this_cpu_xchg and
this_cpu_cmpxchg, this_cpu_cmpxchg_double etc?