From: Alice Ryhl <aliceryhl@google.com>
To: Deborah Brouwer <deborah.brouwer@collabora.com>
Cc: "Alice Ryhl" <aliceryhl@google.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun@kernel.org>, "Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Tamir Duberstein" <tamird@kernel.org>,
"Alexandre Courbot" <acourbot@nvidia.com>,
"Onur Özkan" <work@onurozkan.dev>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v4 2/3] rust: uaccess: add method to get UserPtr from u64
Date: Wed, 21 Oct 2026 08:52:17 +0000 [thread overview]
Message-ID: <20261021085219.426333-1-aliceryhl@google.com> (raw)
In-Reply-To: <20261020-b4-dev_query_fixes-v4-2-df66b4c98bc6@collabora.com>
On Tue, Oct 20, 2026 at 05:06:46PM -0700, Deborah Brouwer wrote:
> Currently a UserPtr can be created from a usize integer representing a
> userspace address. To create a UserPtr from a u64 integer, the u64 must
> be cast to usize. On 32-bit systems, this cast will discard the upper 32
> bits of the address.
>
> Provide a new method to create a UserPtr from a u64 integer. This avoids
> the caller having to cast before creating a UserPtr and also clarifies
> that the truncation is intended. This is equivalent to the C-side
> macro u64_to_user_ptr() that provides typechecking and casting to a __user
> pointer.
>
> Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
next prev parent reply other threads:[~2026-10-21 8:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 0:06 [PATCH v4 0/3] drm/tyr: allow mismatched buffers for dev_query Deborah Brouwer
2026-10-21 0:06 ` [PATCH v4 1/3] rust: uaccess: add UserSliceWriter::clear() Deborah Brouwer
2026-10-21 0:06 ` [PATCH v4 2/3] rust: uaccess: add method to get UserPtr from u64 Deborah Brouwer
2026-10-21 8:52 ` Alice Ryhl [this message]
2026-10-21 0:06 ` [PATCH v4 3/3] drm/tyr: allow userspace buffers to be mismatched Deborah Brouwer
2026-10-21 8:52 ` Alice Ryhl
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