[PATCH v4 6/7] rust: alloc: layout: implement ArrayLayout::size()

[Danilo Krummrich <dakr@kernel.org>]

Provide a convenience method for ArrayLayout to calculate the size of
the ArrayLayout in bytes.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/alloc/layout.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rust/kernel/alloc/layout.rs b/rust/kernel/alloc/layout.rs
index 93ed514f7cc7..5c3db8e9f930 100644
--- a/rust/kernel/alloc/layout.rs
+++ b/rust/kernel/alloc/layout.rs
@@ -98,6 +98,11 @@ pub const fn len(&self) -> usize {
     pub const fn is_empty(&self) -> bool {
         self.len == 0
     }
+
+    /// Returns the size of the [`ArrayLayout`] in bytes.
+    pub const fn size(&self) -> usize {
+        self.len() * size_of::<T>()
+    }
 }
 
 impl<T> From<ArrayLayout<T>> for Layout {
-- 
2.50.1