rust: impl_flags: use bit helper in example

Use bit_u32() instead of open-coding shifts in the impl_flags! example.
This demonstrates the checked bit helper and ensures that bit positions
remain within the underlying u32 type.

Suggested-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1244
Assisted-by: OpenCode:openai/gpt-5.6-sol
Signed-off-by: Kosumi Chan <chankocyo@gmail.com>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/rust-for-linux/2026071054-hazing-antirust-8e40@gregkh/
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260711082327.3062227-1-chankocyo@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/rust/kernel/impl_flags.rs b/rust/kernel/impl_flags.rs
index e2bd7639da12..fdf44d5eea9c 100644
--- a/rust/kernel/impl_flags.rs
+++ b/rust/kernel/impl_flags.rs
@@ -19,7 +19,10 @@
 /// # Examples
 ///
 /// ```
-/// use kernel::impl_flags;
+/// use kernel::{
+///     bits::bit_u32,
+///     impl_flags, //
+/// };
 ///
 /// impl_flags!(
 ///     /// Represents multiple permissions.
@@ -30,13 +33,13 @@
 ///     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 ///     pub enum Permission {
 ///         /// Read permission.
-///         Read = 1 << 0,
+///         Read = bit_u32(0),
 ///
 ///         /// Write permission.
-///         Write = 1 << 1,
+///         Write = bit_u32(1),
 ///
 ///         /// Execute permission.
-///         Execute = 1 << 2,
+///         Execute = bit_u32(2),
 ///     }
 /// );
 ///