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h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=yKA+rjO6S2yRbNZMtjsewu159Akak1qQqcaEuzo5K58=; b=lQde1zTuHBY1gsZZb4ZWAawXFOBL7sVIk378pR7XUSMj7M29kQiw7KI6gJw2AMHe zkQqPe/JK8FKY/OKM9lCtVUWpHkZy7ycS4XyCdSdjnYL+R+2lHKEaBS7mrandheg5IN Mu085UYJdDmvU6alVm3oNqwS3nBoZTCxI666rkzQ= Received: by smtp.zohomail.com with SMTPS id 1792541208950353.81731289226013; Tue, 20 Oct 2026 17:06:48 -0700 (PDT) From: Deborah Brouwer Date: Tue, 20 Oct 2026 17:06:46 -0700 Subject: [PATCH v4 2/3] rust: uaccess: add method to get UserPtr from u64 X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261020-b4-dev_query_fixes-v4-2-df66b4c98bc6@collabora.com> References: <20261020-b4-dev_query_fixes-v4-0-df66b4c98bc6@collabora.com> In-Reply-To: <20261020-b4-dev_query_fixes-v4-0-df66b4c98bc6@collabora.com> To: Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , =?utf-8?q?Onur_=C3=96zkan?= , David Airlie , Simona Vetter Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Deborah Brouwer X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1403; i=deborah.brouwer@collabora.com; h=from:subject:message-id; bh=WNaLWF3sjYdXQjRj645udU5OHS/SnUHc+mDrPyN+V1M=; b=owGbwMvMwCVWuULzOU9c7WvG02pJDFk3mES/Rm15pjdFQOJ60F1vvlUZHzxd1dbOvb3Trrl+n VRwVvnujlIWBjEuBlkxRZaz9kY94lXvjXTn/2+GmcPKBDKEgYtTACbido2R4d/PzHsHZ7FEPFiV sEvh6xSVK9vuz03qM7F0W8lvzDpfoYqR4W69fdvnpSvSlvlXvlo0ebH+4VOl7+Y4HJ8oYsItfy3 pMDsA X-Developer-Key: i=deborah.brouwer@collabora.com; a=openpgp; fpr=CD3F328C177AEF322D9FFF8379A829E70C5E7DEB 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 --- rust/kernel/uaccess.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs index 8e18285ec44b..a6fd1af155b3 100644 --- a/rust/kernel/uaccess.rs +++ b/rust/kernel/uaccess.rs @@ -31,6 +31,15 @@ pub fn from_addr(addr: usize) -> Self { Self(addr as *mut c_void) } + /// Create a `UserPtr` from a u64 userspace address. + /// + /// Deliberately truncate upper bits for 32-bit systems. + #[doc(alias = "u64_to_user_ptr")] + #[inline] + pub fn from_u64(addr: u64) -> Self { + Self::from_addr(addr as usize) + } + /// Create a `UserPtr` from a pointer representing the userspace address. #[inline] pub fn from_ptr(addr: *mut c_void) -> Self { -- 2.56.0