From: Alice Ryhl <aliceryhl@google.com>
To: "Yury Norov (NVIDIA)" <yury.norov@gmail.com>
Cc: "Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Danilo Krummrich" <dakr@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"John Hubbard" <jhubbard@nvidia.com>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org
Subject: Re: [PATCH] uaccess: decouple INLINE_COPY_FROM_USER and CONFIG_RUST
Date: Fri, 24 Oct 2025 09:12:56 +0000 [thread overview]
Message-ID: <aPtDGA0JjmfDvxXd@google.com> (raw)
In-Reply-To: <20251023171607.1171534-1-yury.norov@gmail.com>
On Thu, Oct 23, 2025 at 01:16:06PM -0400, Yury Norov (NVIDIA) wrote:
> Commit 1f9a8286bc0c ("uaccess: always export _copy_[from|to]_user with
> CONFIG_RUST") exports _copy_{from,to}_user() unconditionally, if RUST
> is enabled. This pollutes exported symbols namespace, and spreads RUST
> ifdefery in core files.
>
> It's better to declare a corresponding helper under the rust/helpers,
> similarly to how non-underscored copy_{from,to}_user() is handled.
>
> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Overall LGTM:
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
In include/linux/uaccess.h there is the comment:
Rust code always uses the extern definition.
I think we should reword this comment as part of this change. You can
say that Rust accesses _inline_copy_from_user() through a helper, or
similar.
After all, when using LTO or other mechanism to inline helpers, it is no
longer the case that Rust always uses the a function call.
Alice
next prev parent reply other threads:[~2025-10-24 9:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-23 17:16 [PATCH] uaccess: decouple INLINE_COPY_FROM_USER and CONFIG_RUST Yury Norov (NVIDIA)
2025-10-24 9:12 ` Alice Ryhl [this message]
2025-10-24 13:45 ` Yury Norov
2025-10-24 13:54 ` Alice Ryhl
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