[v5,11/11] rust: helpers: Remove uaccess helpers

Commit Message

Alistair Francis Jan. 7, 2025, 3:50 a.m. UTC

Now that we support wrap-static-fns we no longer need the custom helper.

Signed-off-by: Alistair Francis <[e-mail]>
Tested-by: Dirk Behme <[e-mail]>
---
 rust/bindgen_static_functions |  3 +++
 rust/helpers/helpers.c        |  6 ++----
 rust/helpers/uaccess.c        | 15 ---------------
 rust/kernel/uaccess.rs        |  5 +++--
 4 files changed, 8 insertions(+), 21 deletions(-)
 delete mode 100644 rust/helpers/uaccess.c

Patch

diff --git a/rust/bindgen_static_functions b/rust/bindgen_static_functions
index 8bc291a7a799..ec48ad2e8c78 100644
--- a/rust/bindgen_static_functions
+++ b/rust/bindgen_static_functions
@@ -27,3 +27,6 @@ 
 
 --allowlist-function get_task_struct
 --allowlist-function put_task_struct
+
+--allowlist-function copy_from_user
+--allowlist-function copy_to_user
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 2731ddf736dd..eae067fe2528 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -1,8 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Non-trivial C macros cannot be used in Rust. Similarly, inlined C functions
- * cannot be called either. This file explicitly creates functions ("helpers")
- * that wrap those so that they can be called from Rust.
+ * Non-trivial C macros cannot be used in Rust. This file explicitly creates
+ * functions ("helpers") that wrap those so that they can be called from Rust.
  *
  * Sorted alphabetically.
  */
@@ -21,7 +20,6 @@ 
 #include "slab.c"
 #include "spinlock.c"
 #include "task.c"
-#include "uaccess.c"
 #include "vmalloc.c"
 #include "wait.c"
 #include "workqueue.c"
diff --git a/rust/helpers/uaccess.c b/rust/helpers/uaccess.c
deleted file mode 100644
index f49076f813cd..000000000000
--- a/rust/helpers/uaccess.c
+++ /dev/null
@@ -1,15 +0,0 @@ 
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/uaccess.h>
-
-unsigned long rust_helper_copy_from_user(void *to, const void __user *from,
-					 unsigned long n)
-{
-	return copy_from_user(to, from, n);
-}
-
-unsigned long rust_helper_copy_to_user(void __user *to, const void *from,
-				       unsigned long n)
-{
-	return copy_to_user(to, from, n);
-}
diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs
index cc044924867b..d8f75de93073 100644
--- a/rust/kernel/uaccess.rs
+++ b/rust/kernel/uaccess.rs
@@ -226,7 +226,8 @@  pub fn read_raw(&mut self, out: &mut [MaybeUninit<u8>]) -> Result {
         }
         // SAFETY: `out_ptr` points into a mutable slice of length `len`, so we may write
         // that many bytes to it.
-        let res = unsafe { bindings::copy_from_user(out_ptr, self.ptr as *const c_void, len) };
+        let res =
+            unsafe { bindings::copy_from_user(out_ptr, self.ptr as *const c_void, len as u64) };
         if res != 0 {
             return Err(EFAULT);
         }
@@ -330,7 +331,7 @@  pub fn write_slice(&mut self, data: &[u8]) -> Result {
         }
         // SAFETY: `data_ptr` points into an immutable slice of length `len`, so we may read
         // that many bytes from it.
-        let res = unsafe { bindings::copy_to_user(self.ptr as *mut c_void, data_ptr, len) };
+        let res = unsafe { bindings::copy_to_user(self.ptr as *mut c_void, data_ptr, len as u64) };
         if res != 0 {
             return Err(EFAULT);
         }