rust: io: add typedef for phys_addr_t

commit dd6ff5cf56fb183fce605ca6a5bfce228cd8888b upstream.

The C typedef phys_addr_t is missing an analogue in Rust, meaning that
we end up using bindings::phys_addr_t or ResourceSize as a replacement
in various places throughout the kernel. Fix that by introducing a new
typedef on the Rust side. Place it next to the existing ResourceSize
typedef since they're quite related to each other.

Cc: stable@vger.kernel.org # for v6.18 [1]
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20251112-resource-phys-typedefs-v2-4-538307384f82@google.com
Link: https://lore.kernel.org/all/20251112-resource-phys-typedefs-v2-0-538307384f82@google.com/ [1]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/rust/kernel/io/resource.rs b/rust/kernel/io/resource.rs
index 7fed41fc2030..0e86ee9c98d8 100644
--- a/rust/kernel/io/resource.rs
+++ b/rust/kernel/io/resource.rs
@@ -12,7 +12,10 @@ use crate::prelude::*;
 use crate::str::{CStr, CString};
 use crate::types::Opaque;
 
-pub use super::ResourceSize;
+pub use super::{
+    PhysAddr,
+    ResourceSize, //
+};
 
 /// A region allocated from a parent [`Resource`].
 ///
@@ -93,7 +96,7 @@ impl Resource {
     /// the region, or a part of it, is already in use.
     pub fn request_region(
         &self,
-        start: ResourceSize,
+        start: PhysAddr,
         size: ResourceSize,
         name: CString,
         flags: Flags,
@@ -127,7 +130,7 @@ impl Resource {
     }
 
     /// Returns the start address of the resource.
-    pub fn start(&self) -> ResourceSize {
+    pub fn start(&self) -> PhysAddr {
         let inner = self.0.get();
         // SAFETY: Safe as per the invariants of `Resource`.
         unsafe { (*inner).start }