linux-kernel - [PATCH v2 17/21] rust: num: Add an upward alignment helper for usize

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Message-Id: <20250501-nova-frts-v2-17-b4a137175337@nvidia.com>
Date: Thu, 01 May 2025 21:58:35 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: 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>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Jonathan Corbet <corbet@....net>
Cc: John Hubbard <jhubbard@...dia.com>, Ben Skeggs <bskeggs@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, linux-kernel@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org, 
 dri-devel@...ts.freedesktop.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v2 17/21] rust: num: Add an upward alignment helper for
 usize

From: Joel Fernandes <joelagnelf@...dia.com>

This will be used in the nova-core driver where we need to upward-align
the image size to get to the next image in the VBIOS ROM.

[acourbot@...dia.com: handled conflicts due to removal of patch creating
num.rs]

Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 rust/kernel/lib.rs |  1 +
 rust/kernel/num.rs | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index ab0286857061d2de1be0279cbd2cd3490e5a48c3..be75b196aa7a29cf3eed7c902ed8fb98689bbb50 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -67,6 +67,7 @@
 pub mod miscdevice;
 #[cfg(CONFIG_NET)]
 pub mod net;
+pub mod num;
 pub mod of;
 pub mod page;
 #[cfg(CONFIG_PCI)]
diff --git a/rust/kernel/num.rs b/rust/kernel/num.rs
new file mode 100644
index 0000000000000000000000000000000000000000..953c6ab012601efb3c9387b4b299e22233670c4b
--- /dev/null
+++ b/rust/kernel/num.rs
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Numerical and binary utilities for primitive types.
+
+/// A trait providing alignment operations for `usize`.
+pub trait UsizeAlign {
+    /// Aligns `self` upwards to the nearest multiple of `align`.
+    fn align_up(self, align: usize) -> usize;
+}
+
+impl UsizeAlign for usize {
+    fn align_up(mut self, align: usize) -> usize {
+        self = (self + align - 1) & !(align - 1);
+        self
+    }
+}
+
+/// Aligns `val` upwards to the nearest multiple of `align`.
+pub const fn usize_align_up(val: usize, align: usize) -> usize {
+    (val + align - 1) & !(align - 1)
+}

-- 
2.49.0