[PATCH] rust: mm: Mark VmaNew as transparent

[Baptiste Lepers <baptiste.lepers@gmail.com>]

Unsafe code in VmaNew's methods assumes that the type has the same
layout as the inner `bindings::vm_area_struct`. This is not guaranteed by
the default struct representation in Rust, but requires specifying the
`transparent` representation.

Fixes: dcb81aeab406e ("mm: rust: add VmaNew for f_ops->mmap()")
Signed-off-by: Baptiste Lepers <baptiste.lepers@gmail.com>
---
 rust/kernel/mm/virt.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/mm/virt.rs b/rust/kernel/mm/virt.rs
index 6086ca981b06..a1bfa4e19293 100644
--- a/rust/kernel/mm/virt.rs
+++ b/rust/kernel/mm/virt.rs
@@ -209,6 +209,7 @@ pub fn vm_insert_page(&self, address: usize, page: &Page) -> Result {
 ///
 /// For the duration of 'a, the referenced vma must be undergoing initialization in an
 /// `f_ops->mmap()` hook.
+#[repr(transparent)]
 pub struct VmaNew {
     vma: VmaRef,
 }
-- 
2.43.0