[PATCH 2/4] rust: io: move ResourceSize to top-level io module

[Alice Ryhl <aliceryhl@google.com>]

Resource sizes are a general concept for dealing with physical
addresses, and not specific to the Resource type, which is just one way
to access physical addresses. Thus, move the typedef to the io module.

Still keep a re-export under resource. This avoids this commit from
being a flag-day, but I also think it's a useful re-export in general so
that you can import

	use kernel::io::resource::{Resource, ResourceSize};

instead of having to write

	use kernel::io::{
	    resource::Resource,
	    ResourceSize,
	};

in the specific cases where you need ResourceSize because you are using
the Resource type. Therefore I think it makes sense to keep this
re-export indefinitely and it is *not* intended as a temporary re-export
for migration purposes.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
 rust/kernel/io.rs          | 6 ++++++
 rust/kernel/io/resource.rs | 6 +-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/rust/kernel/io.rs b/rust/kernel/io.rs
index ee182b0b5452dfcc9891d46cc6cd84d0cf7cdae7..6465ea94e85d689aef1f9031a4a5cc9505b9af6e 100644
--- a/rust/kernel/io.rs
+++ b/rust/kernel/io.rs
@@ -13,6 +13,12 @@
 
 pub use resource::Resource;
 
+/// Resource Size type.
+///
+/// This is a type alias to either `u32` or `u64` depending on the config option
+/// `CONFIG_PHYS_ADDR_T_64BIT`, and it can be a u64 even on 32-bit architectures.
+pub type ResourceSize = bindings::resource_size_t;
+
 /// Raw representation of an MMIO region.
 ///
 /// By itself, the existence of an instance of this structure does not provide any guarantees that
diff --git a/rust/kernel/io/resource.rs b/rust/kernel/io/resource.rs
index 11b6bb9678b4e36603cc26fa2d6552c0a7e8276c..7fed41fc20307fa7ce230da4b7841743631c965e 100644
--- a/rust/kernel/io/resource.rs
+++ b/rust/kernel/io/resource.rs
@@ -12,11 +12,7 @@
 use crate::str::{CStr, CString};
 use crate::types::Opaque;
 
-/// Resource Size type.
-///
-/// This is a type alias to either `u32` or `u64` depending on the config option
-/// `CONFIG_PHYS_ADDR_T_64BIT`, and it can be a u64 even on 32-bit architectures.
-pub type ResourceSize = bindings::resource_size_t;
+pub use super::ResourceSize;
 
 /// A region allocated from a parent [`Resource`].
 ///

-- 
2.51.2.1026.g39e6a42477-goog