linux-kernel - [PATCH v2 3/5] rust: num: add `as_bool` method to `Bounded<

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Message-Id: <20260121-register-v2-3-79d9b8d5e36a@nvidia.com>
Date: Wed, 21 Jan 2026 16:23:55 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Daniel Almeida <daniel.almeida@...labora.com>, 
 Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, 
 Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Trevor Gross <tmgross@...ch.edu>
Cc: Yury Norov <yury.norov@...il.com>, John Hubbard <jhubbard@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
 Edwin Peer <epeer@...dia.com>, Eliot Courtney <ecourtney@...dia.com>, 
 Dirk Behme <dirk.behme@...bosch.com>, Steven Price <steven.price@....com>, 
 rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v2 3/5] rust: num: add `as_bool` method to `Bounded<_, 1>`

Single-bit numbers are typically treated as booleans. There is an
`Into<bool>` implementation for those, but invoking it from contexts
that lack type expectations is not always convenient.

Add an `as_bool` method as a simpler shortcut.

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 rust/kernel/num/bounded.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/rust/kernel/num/bounded.rs b/rust/kernel/num/bounded.rs
index 8782535770f1..8407606f2fa7 100644
--- a/rust/kernel/num/bounded.rs
+++ b/rust/kernel/num/bounded.rs
@@ -1096,3 +1096,24 @@ fn from(value: bool) -> Self {
         Self::__new(T::from(value))
     }
 }
+
+impl<T> Bounded<T, 1>
+where
+    T: Integer + Zeroable,
+{
+    /// Returns the value of this `Bounded` as a `bool`.
+    ///
+    /// This is a shorter way of writing `bool::from(self)`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use kernel::num::Bounded;
+    ///
+    /// assert_eq!(Bounded::<u8, 1>::new::<0>().as_bool(), false);
+    /// assert_eq!(Bounded::<u8, 1>::new::<1>().as_bool(), true);
+    /// ```
+    pub fn as_bool(self) -> bool {
+        self.into()
+    }
+}

-- 
2.52.0