[PATCH v10 4/8] rust: ffi: Convert pub use to pub mod and create ffi module

[Joel Fernandes <joelagnelf@nvidia.com>]

Convert `pub use ffi` to `pub mod ffi` in lib.rs and create the
corresponding `rust/kernel/ffi/mod.rs` module file. Also re-export all C
type definitions from `ffi` crate so that existing `kernel::ffi::c_int`
etc. paths continue to work.

This prepares the ffi module to host additional sub-modules in later
patches (clist).

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
---
 rust/kernel/ffi/mod.rs | 7 +++++++
 rust/kernel/lib.rs     | 3 +--
 2 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 rust/kernel/ffi/mod.rs

diff --git a/rust/kernel/ffi/mod.rs b/rust/kernel/ffi/mod.rs
new file mode 100644
index 000000000000..7d844e9cb339
--- /dev/null
+++ b/rust/kernel/ffi/mod.rs
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! FFI infrastructure for interfacing with C code.
+
+// Re-export C type definitions from the `ffi` crate so that existing
+// `kernel::ffi::c_int` etc. paths continue to work.
+pub use ::ffi::*;
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 3da92f18f4ee..0a77b4c0ffeb 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -62,8 +62,6 @@
 // Allow proc-macros to refer to `::kernel` inside the `kernel` crate (this crate).
 extern crate self as kernel;
 
-pub use ffi;
-
 pub mod acpi;
 pub mod alloc;
 #[cfg(CONFIG_AUXILIARY_BUS)]
@@ -93,6 +91,7 @@
 pub mod drm;
 pub mod error;
 pub mod faux;
+pub mod ffi;
 #[cfg(CONFIG_RUST_FW_LOADER_ABSTRACTIONS)]
 pub mod firmware;
 pub mod fmt;
-- 
2.34.1