[PATCH 3/5] rust: use custom FFI integer types

From: Gary Guo
Date: Fri Sep 13 2024 - 17:33:41 EST

Currently FFI integer types are defined in libcore. This commit creates
the `ffi` crate and asks bindgen to use that crate for FFI integer types
instead of `core::ffi`.

This commit is preparatory and no type changes are made in this commit
yet.

Signed-off-by: Gary Guo <gary@xxxxxxxxxxx>
---
rust/Makefile | 18 ++++++++++++------
rust/ffi.rs | 13 +++++++++++++
rust/kernel/alloc/allocator.rs | 4 ++--
rust/kernel/block/mq/operations.rs | 18 +++++++++---------
rust/kernel/block/mq/raw_writer.rs | 2 +-
rust/kernel/block/mq/tag_set.rs | 2 +-
rust/kernel/error.rs | 20 ++++++++++----------
rust/kernel/init.rs | 2 +-
rust/kernel/lib.rs | 2 ++
rust/kernel/net/phy.rs | 14 +++++++-------
rust/kernel/str.rs | 4 ++--
rust/kernel/sync/arc.rs | 6 +++---
rust/kernel/sync/condvar.rs | 2 +-
rust/kernel/sync/lock.rs | 2 +-
rust/kernel/sync/lock/mutex.rs | 2 +-
rust/kernel/sync/lock/spinlock.rs | 2 +-
rust/kernel/task.rs | 8 ++------
rust/kernel/time.rs | 4 ++--
rust/kernel/types.rs | 26 +++++++++++++-------------
rust/kernel/uaccess.rs | 6 +++---
rust/macros/module.rs | 8 ++++----
21 files changed, 91 insertions(+), 74 deletions(-)
create mode 100644 rust/ffi.rs

diff --git a/rust/Makefile b/rust/Makefile
index 863d87ad0ce68..041ebc5db50b9 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -3,7 +3,7 @@
# Where to place rustdoc generated documentation
rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc

-obj-$(CONFIG_RUST) += core.o compiler_builtins.o
+obj-$(CONFIG_RUST) += core.o compiler_builtins.o ffi.o
always-$(CONFIG_RUST) += exports_core_generated.h

# Missing prototypes are expected in the helpers since these are exported
@@ -114,7 +114,7 @@ rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
rustdoc-alloc: $(RUST_LIB_SRC)/alloc/src/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
+$(call if_changed,rustdoc)

-rustdoc-kernel: private rustc_target_flags = --extern alloc \
+rustdoc-kernel: private rustc_target_flags = --extern alloc --extern ffi \
--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
--extern bindings --extern uapi
rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
@@ -274,7 +274,7 @@ bindgen_c_flags_final = $(bindgen_c_flags_lto) -fno-builtin -D__BINDGEN__
quiet_cmd_bindgen = BINDGEN $@
cmd_bindgen = \
$(BINDGEN) $< $(bindgen_target_flags) \
- --use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
+ --use-core --with-derive-default --ctypes-prefix ffi --no-layout-tests \
--no-debug '.*' --enable-function-attribute-detection \
-o $@ -- $(bindgen_c_flags_final) -DMODULE \
$(bindgen_target_cflags) $(bindgen_target_extra)
@@ -411,19 +411,25 @@ $(obj)/alloc.o: $(RUST_LIB_SRC)/alloc/src/lib.rs $(obj)/compiler_builtins.o FORC
$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
+$(call if_changed_rule,rustc_library)

+$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE
+ +$(call if_changed_rule,rustc_library)
+
+$(obj)/bindings.o: private rustc_target_flags = --extern ffi
$(obj)/bindings.o: $(src)/bindings/lib.rs \
- $(obj)/compiler_builtins.o \
+ $(obj)/ffi.o \
$(obj)/bindings/bindings_generated.rs \
$(obj)/bindings/bindings_helpers_generated.rs FORCE
+$(call if_changed_rule,rustc_library)

+$(obj)/uapi.o: private rustc_target_flags = --extern ffi
$(obj)/uapi.o: $(src)/uapi/lib.rs \
- $(obj)/compiler_builtins.o \
+ $(obj)/ffi.o \
$(obj)/uapi/uapi_generated.rs FORCE
+$(call if_changed_rule,rustc_library)

$(obj)/kernel.o: private rustc_target_flags = --extern alloc \
- --extern build_error --extern macros --extern bindings --extern uapi
+ --extern build_error --extern macros --extern ffi \
+ --extern bindings --extern uapi
$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
$(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
+$(call if_changed_rule,rustc_library)
diff --git a/rust/ffi.rs b/rust/ffi.rs
new file mode 100644
index 0000000000000..1894a511ee171
--- /dev/null
+++ b/rust/ffi.rs
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Foreign function interface (FFI) types.
+//!
+//! This crate provides mapping from C primitive types to Rust ones.
+//!
+//! Rust core crate provides [`core::ffi`], which maps integer types to platform default C ABI.
+//! Kernel does not use `core::ffi` so it can customise the mapping that deviates from platform
+//! default.
+
+#![no_std]
+
+pub use core::ffi::*;
diff --git a/rust/kernel/alloc/allocator.rs b/rust/kernel/alloc/allocator.rs
index e6ea601f38c6d..e7a5937a98b09 100644
--- a/rust/kernel/alloc/allocator.rs
+++ b/rust/kernel/alloc/allocator.rs
@@ -28,7 +28,7 @@ pub(crate) unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: F
// function safety requirement.
// - `size` is greater than 0 since it's from `layout.size()` (which cannot be zero according
// to the function safety requirement)
- unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags.0) as *mut u8 }
+ unsafe { bindings::krealloc(ptr as *const crate::ffi::c_void, size, flags.0) as *mut u8 }
}

unsafe impl GlobalAlloc for KernelAllocator {
@@ -40,7 +40,7 @@ unsafe fn alloc(&self, layout: Layout) -> *mut u8 {

unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
unsafe {
- bindings::kfree(ptr as *const core::ffi::c_void);
+ bindings::kfree(ptr as *const crate::ffi::c_void);
}
}

diff --git a/rust/kernel/block/mq/operations.rs b/rust/kernel/block/mq/operations.rs
index 9ba7fdfeb4b22..c8646d0d98669 100644
--- a/rust/kernel/block/mq/operations.rs
+++ b/rust/kernel/block/mq/operations.rs
@@ -131,7 +131,7 @@ impl<T: Operations> OperationsVTable<T> {
unsafe extern "C" fn poll_callback(
_hctx: *mut bindings::blk_mq_hw_ctx,
_iob: *mut bindings::io_comp_batch,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
T::poll().into()
}

@@ -145,9 +145,9 @@ impl<T: Operations> OperationsVTable<T> {
/// for the same context.
unsafe extern "C" fn init_hctx_callback(
_hctx: *mut bindings::blk_mq_hw_ctx,
- _tagset_data: *mut core::ffi::c_void,
- _hctx_idx: core::ffi::c_uint,
- ) -> core::ffi::c_int {
+ _tagset_data: *mut crate::ffi::c_void,
+ _hctx_idx: crate::ffi::c_uint,
+ ) -> crate::ffi::c_int {
from_result(|| Ok(0))
}

@@ -159,7 +159,7 @@ impl<T: Operations> OperationsVTable<T> {
/// This function may only be called by blk-mq C infrastructure.
unsafe extern "C" fn exit_hctx_callback(
_hctx: *mut bindings::blk_mq_hw_ctx,
- _hctx_idx: core::ffi::c_uint,
+ _hctx_idx: crate::ffi::c_uint,
) {
}

@@ -176,9 +176,9 @@ impl<T: Operations> OperationsVTable<T> {
unsafe extern "C" fn init_request_callback(
_set: *mut bindings::blk_mq_tag_set,
rq: *mut bindings::request,
- _hctx_idx: core::ffi::c_uint,
- _numa_node: core::ffi::c_uint,
- ) -> core::ffi::c_int {
+ _hctx_idx: crate::ffi::c_uint,
+ _numa_node: crate::ffi::c_uint,
+ ) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: By the safety requirements of this function, `rq` points
// to a valid allocation.
@@ -203,7 +203,7 @@ impl<T: Operations> OperationsVTable<T> {
unsafe extern "C" fn exit_request_callback(
_set: *mut bindings::blk_mq_tag_set,
rq: *mut bindings::request,
- _hctx_idx: core::ffi::c_uint,
+ _hctx_idx: crate::ffi::c_uint,
) {
// SAFETY: The tagset invariants guarantee that all requests are allocated with extra memory
// for the request data.
diff --git a/rust/kernel/block/mq/raw_writer.rs b/rust/kernel/block/mq/raw_writer.rs
index 9222465d670bf..7e2159e4f6a6f 100644
--- a/rust/kernel/block/mq/raw_writer.rs
+++ b/rust/kernel/block/mq/raw_writer.rs
@@ -25,7 +25,7 @@ fn new(buffer: &'a mut [u8]) -> Result<RawWriter<'a>> {
}

pub(crate) fn from_array<const N: usize>(
- a: &'a mut [core::ffi::c_char; N],
+ a: &'a mut [crate::ffi::c_char; N],
) -> Result<RawWriter<'a>> {
Self::new(
// SAFETY: the buffer of `a` is valid for read and write as `u8` for
diff --git a/rust/kernel/block/mq/tag_set.rs b/rust/kernel/block/mq/tag_set.rs
index f9a1ca655a35b..d7f175a05d992 100644
--- a/rust/kernel/block/mq/tag_set.rs
+++ b/rust/kernel/block/mq/tag_set.rs
@@ -53,7 +53,7 @@ pub fn new(
queue_depth: num_tags,
cmd_size,
flags: bindings::BLK_MQ_F_SHOULD_MERGE,
- driver_data: core::ptr::null_mut::<core::ffi::c_void>(),
+ driver_data: core::ptr::null_mut::<crate::ffi::c_void>(),
nr_maps: num_maps,
..tag_set
}
diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
index 6f1587a2524e8..1090a13c2bd17 100644
--- a/rust/kernel/error.rs
+++ b/rust/kernel/error.rs
@@ -88,14 +88,14 @@ macro_rules! declare_err {
///
/// The value is a valid `errno` (i.e. `>= -MAX_ERRNO && < 0`).
#[derive(Clone, Copy, PartialEq, Eq)]
-pub struct Error(core::ffi::c_int);
+pub struct Error(crate::ffi::c_int);

impl Error {
/// Creates an [`Error`] from a kernel error code.
///
/// It is a bug to pass an out-of-range `errno`. `EINVAL` would
/// be returned in such a case.
- pub(crate) fn from_errno(errno: core::ffi::c_int) -> Error {
+ pub(crate) fn from_errno(errno: crate::ffi::c_int) -> Error {
if errno < -(bindings::MAX_ERRNO as i32) || errno >= 0 {
// TODO: Make it a `WARN_ONCE` once available.
crate::pr_warn!(
@@ -115,14 +115,14 @@ pub(crate) fn from_errno(errno: core::ffi::c_int) -> Error {
/// # Safety
///
/// `errno` must be within error code range (i.e. `>= -MAX_ERRNO && < 0`).
- unsafe fn from_errno_unchecked(errno: core::ffi::c_int) -> Error {
+ unsafe fn from_errno_unchecked(errno: crate::ffi::c_int) -> Error {
// INVARIANT: The contract ensures the type invariant
// will hold.
Error(errno)
}

/// Returns the kernel error code.
- pub fn to_errno(self) -> core::ffi::c_int {
+ pub fn to_errno(self) -> crate::ffi::c_int {
self.0
}

@@ -239,7 +239,7 @@ fn from(e: core::convert::Infallible) -> Error {

/// Converts an integer as returned by a C kernel function to an error if it's negative, and
/// `Ok(())` otherwise.
-pub fn to_result(err: core::ffi::c_int) -> Result {
+pub fn to_result(err: crate::ffi::c_int) -> Result {
if err < 0 {
Err(Error::from_errno(err))
} else {
@@ -262,7 +262,7 @@ pub fn to_result(err: core::ffi::c_int) -> Result {
/// fn devm_platform_ioremap_resource(
/// pdev: &mut PlatformDevice,
/// index: u32,
-/// ) -> Result<*mut core::ffi::c_void> {
+/// ) -> Result<*mut kernel::ffi::c_void> {
/// // SAFETY: `pdev` points to a valid platform device. There are no safety requirements
/// // on `index`.
/// from_err_ptr(unsafe { bindings::devm_platform_ioremap_resource(pdev.to_ptr(), index) })
@@ -271,8 +271,8 @@ pub fn to_result(err: core::ffi::c_int) -> Result {
// TODO: Remove `dead_code` marker once an in-kernel client is available.
#[allow(dead_code)]
pub(crate) fn from_err_ptr<T>(ptr: *mut T) -> Result<*mut T> {
- // CAST: Casting a pointer to `*const core::ffi::c_void` is always valid.
- let const_ptr: *const core::ffi::c_void = ptr.cast();
+ // CAST: Casting a pointer to `*const crate::ffi::c_void` is always valid.
+ let const_ptr: *const crate::ffi::c_void = ptr.cast();
// SAFETY: The FFI function does not deref the pointer.
if unsafe { bindings::IS_ERR(const_ptr) } {
// SAFETY: The FFI function does not deref the pointer.
@@ -287,7 +287,7 @@ pub(crate) fn from_err_ptr<T>(ptr: *mut T) -> Result<*mut T> {
// SAFETY: `IS_ERR()` ensures `err` is a
// negative value greater-or-equal to `-bindings::MAX_ERRNO`.
#[allow(clippy::unnecessary_cast)]
- return Err(unsafe { Error::from_errno_unchecked(err as core::ffi::c_int) });
+ return Err(unsafe { Error::from_errno_unchecked(err as crate::ffi::c_int) });
}
Ok(ptr)
}
@@ -307,7 +307,7 @@ pub(crate) fn from_err_ptr<T>(ptr: *mut T) -> Result<*mut T> {
/// # use kernel::bindings;
/// unsafe extern "C" fn probe_callback(
/// pdev: *mut bindings::platform_device,
-/// ) -> core::ffi::c_int {
+/// ) -> kernel::ffi::c_int {
/// from_result(|| {
/// let ptr = devm_alloc(pdev)?;
/// bindings::platform_set_drvdata(pdev, ptr);
diff --git a/rust/kernel/init.rs b/rust/kernel/init.rs
index a17ac8762d8f9..e0a757bd42f0c 100644
--- a/rust/kernel/init.rs
+++ b/rust/kernel/init.rs
@@ -133,7 +133,7 @@
//! # }
//! # // `Error::from_errno` is `pub(crate)` in the `kernel` crate, thus provide a workaround.
//! # trait FromErrno {
-//! # fn from_errno(errno: core::ffi::c_int) -> Error {
+//! # fn from_errno(errno: kernel::ffi::c_int) -> Error {
//! # // Dummy error that can be constructed outside the `kernel` crate.
//! # Error::from(core::fmt::Error)
//! # }
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index f10b06a78b9d5..fbce57c09fe0c 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -26,6 +26,8 @@
// Allow proc-macros to refer to `::kernel` inside the `kernel` crate (this crate).
extern crate self as kernel;

+pub use ffi;
+
pub mod alloc;
#[cfg(CONFIG_BLOCK)]
pub mod block;
diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index fd40b703d2244..d1a44ab2a408d 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -327,7 +327,7 @@ impl<T: Driver> Adapter<T> {
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
unsafe extern "C" fn soft_reset_callback(
phydev: *mut bindings::phy_device,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: This callback is called only in contexts
// where we hold `phy_device->lock`, so the accessors on
@@ -343,7 +343,7 @@ impl<T: Driver> Adapter<T> {
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
unsafe extern "C" fn get_features_callback(
phydev: *mut bindings::phy_device,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: This callback is called only in contexts
// where we hold `phy_device->lock`, so the accessors on
@@ -357,7 +357,7 @@ impl<T: Driver> Adapter<T> {
/// # Safety
///
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
- unsafe extern "C" fn suspend_callback(phydev: *mut bindings::phy_device) -> core::ffi::c_int {
+ unsafe extern "C" fn suspend_callback(phydev: *mut bindings::phy_device) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: The C core code ensures that the accessors on
// `Device` are okay to call even though `phy_device->lock`
@@ -371,7 +371,7 @@ impl<T: Driver> Adapter<T> {
/// # Safety
///
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
- unsafe extern "C" fn resume_callback(phydev: *mut bindings::phy_device) -> core::ffi::c_int {
+ unsafe extern "C" fn resume_callback(phydev: *mut bindings::phy_device) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: The C core code ensures that the accessors on
// `Device` are okay to call even though `phy_device->lock`
@@ -387,7 +387,7 @@ impl<T: Driver> Adapter<T> {
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
unsafe extern "C" fn config_aneg_callback(
phydev: *mut bindings::phy_device,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: This callback is called only in contexts
// where we hold `phy_device->lock`, so the accessors on
@@ -403,7 +403,7 @@ impl<T: Driver> Adapter<T> {
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
unsafe extern "C" fn read_status_callback(
phydev: *mut bindings::phy_device,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
from_result(|| {
// SAFETY: This callback is called only in contexts
// where we hold `phy_device->lock`, so the accessors on
@@ -419,7 +419,7 @@ impl<T: Driver> Adapter<T> {
/// `phydev` must be passed by the corresponding callback in `phy_driver`.
unsafe extern "C" fn match_phy_device_callback(
phydev: *mut bindings::phy_device,
- ) -> core::ffi::c_int {
+ ) -> crate::ffi::c_int {
// SAFETY: This callback is called only in contexts
// where we hold `phy_device->lock`, so the accessors on
// `Device` are okay to call.
diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index bb8d4f41475b5..3980d37bd4b29 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -185,7 +185,7 @@ pub const fn is_empty(&self) -> bool {
/// last at least `'a`. When `CStr` is alive, the memory pointed by `ptr`
/// must not be mutated.
#[inline]
- pub unsafe fn from_char_ptr<'a>(ptr: *const core::ffi::c_char) -> &'a Self {
+ pub unsafe fn from_char_ptr<'a>(ptr: *const crate::ffi::c_char) -> &'a Self {
// SAFETY: The safety precondition guarantees `ptr` is a valid pointer
// to a `NUL`-terminated C string.
let len = unsafe { bindings::strlen(ptr) } + 1;
@@ -248,7 +248,7 @@ pub unsafe fn from_bytes_with_nul_unchecked_mut(bytes: &mut [u8]) -> &mut CStr {

/// Returns a C pointer to the string.
#[inline]
- pub const fn as_char_ptr(&self) -> *const core::ffi::c_char {
+ pub const fn as_char_ptr(&self) -> *const crate::ffi::c_char {
self.0.as_ptr() as _
}

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index 3021f30fd822f..ec95bf6157561 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -336,11 +336,11 @@ pub fn into_unique_or_drop(self) -> Option<Pin<UniqueArc<T>>> {
impl<T: 'static> ForeignOwnable for Arc<T> {
type Borrowed<'a> = ArcBorrow<'a, T>;

- fn into_foreign(self) -> *const core::ffi::c_void {
+ fn into_foreign(self) -> *const crate::ffi::c_void {
ManuallyDrop::new(self).ptr.as_ptr() as _
}

- unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> ArcBorrow<'a, T> {
+ unsafe fn borrow<'a>(ptr: *const crate::ffi::c_void) -> ArcBorrow<'a, T> {
// SAFETY: By the safety requirement of this function, we know that `ptr` came from
// a previous call to `Arc::into_foreign`.
let inner = NonNull::new(ptr as *mut ArcInner<T>).unwrap();
@@ -350,7 +350,7 @@ unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> ArcBorrow<'a, T> {
unsafe { ArcBorrow::new(inner) }
}

- unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self {
+ unsafe fn from_foreign(ptr: *const crate::ffi::c_void) -> Self {
// SAFETY: By the safety requirement of this function, we know that `ptr` came from
// a previous call to `Arc::into_foreign`, which guarantees that `ptr` is valid and
// holds a reference count increment that is transferrable to us.
diff --git a/rust/kernel/sync/condvar.rs b/rust/kernel/sync/condvar.rs
index 2b306afbe56d9..fd9a67f5a2efd 100644
--- a/rust/kernel/sync/condvar.rs
+++ b/rust/kernel/sync/condvar.rs
@@ -7,6 +7,7 @@

use super::{lock::Backend, lock::Guard, LockClassKey};
use crate::{
+ ffi::{c_int, c_long},
init::PinInit,
pin_init,
str::CStr,
@@ -14,7 +15,6 @@
time::Jiffies,
types::Opaque,
};
-use core::ffi::{c_int, c_long};
use core::marker::PhantomPinned;
use core::ptr;
use macros::pin_data;
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index f6c34ca4d819f..9f6a5d2373bbc 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -46,7 +46,7 @@ pub unsafe trait Backend {
/// remain valid for read indefinitely.
unsafe fn init(
ptr: *mut Self::State,
- name: *const core::ffi::c_char,
+ name: *const crate::ffi::c_char,
key: *mut bindings::lock_class_key,
);

diff --git a/rust/kernel/sync/lock/mutex.rs b/rust/kernel/sync/lock/mutex.rs
index 30632070ee670..abd7701578255 100644
--- a/rust/kernel/sync/lock/mutex.rs
+++ b/rust/kernel/sync/lock/mutex.rs
@@ -96,7 +96,7 @@ unsafe impl super::Backend for MutexBackend {

unsafe fn init(
ptr: *mut Self::State,
- name: *const core::ffi::c_char,
+ name: *const crate::ffi::c_char,
key: *mut bindings::lock_class_key,
) {
// SAFETY: The safety requirements ensure that `ptr` is valid for writes, and `name` and
diff --git a/rust/kernel/sync/lock/spinlock.rs b/rust/kernel/sync/lock/spinlock.rs
index ea5c5bc1ce12e..e4891670e9f3f 100644
--- a/rust/kernel/sync/lock/spinlock.rs
+++ b/rust/kernel/sync/lock/spinlock.rs
@@ -95,7 +95,7 @@ unsafe impl super::Backend for SpinLockBackend {

unsafe fn init(
ptr: *mut Self::State,
- name: *const core::ffi::c_char,
+ name: *const crate::ffi::c_char,
key: *mut bindings::lock_class_key,
) {
// SAFETY: The safety requirements ensure that `ptr` is valid for writes, and `name` and
diff --git a/rust/kernel/task.rs b/rust/kernel/task.rs
index 55dff7e088bf5..5bce090a38697 100644
--- a/rust/kernel/task.rs
+++ b/rust/kernel/task.rs
@@ -4,13 +4,9 @@
//!
//! C header: [`include/linux/sched.h`](srctree/include/linux/sched.h).

+use crate::ffi::{c_int, c_long, c_uint};
use crate::types::Opaque;
-use core::{
- ffi::{c_int, c_long, c_uint},
- marker::PhantomData,
- ops::Deref,
- ptr,
-};
+use core::{marker::PhantomData, ops::Deref, ptr};

/// A sentinel value used for infinite timeouts.
pub const MAX_SCHEDULE_TIMEOUT: c_long = c_long::MAX;
diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index e3bb5e89f88da..379c0f5772e57 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -12,10 +12,10 @@
pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;

/// The time unit of Linux kernel. One jiffy equals (1/HZ) second.
-pub type Jiffies = core::ffi::c_ulong;
+pub type Jiffies = crate::ffi::c_ulong;

/// The millisecond time unit.
-pub type Msecs = core::ffi::c_uint;
+pub type Msecs = crate::ffi::c_uint;

/// Converts milliseconds to jiffies.
#[inline]
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 9e7ca066355cd..452328c675b7d 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -31,7 +31,7 @@ pub trait ForeignOwnable: Sized {
/// For example, it might be invalid, dangling or pointing to uninitialized memory. Using it in
/// any way except for [`ForeignOwnable::from_foreign`], [`ForeignOwnable::borrow`],
/// [`ForeignOwnable::try_from_foreign`] can result in undefined behavior.
- fn into_foreign(self) -> *const core::ffi::c_void;
+ fn into_foreign(self) -> *const crate::ffi::c_void;

/// Borrows a foreign-owned object.
///
@@ -39,7 +39,7 @@ pub trait ForeignOwnable: Sized {
///
/// `ptr` must have been returned by a previous call to [`ForeignOwnable::into_foreign`] for
/// which a previous matching [`ForeignOwnable::from_foreign`] hasn't been called yet.
- unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> Self::Borrowed<'a>;
+ unsafe fn borrow<'a>(ptr: *const crate::ffi::c_void) -> Self::Borrowed<'a>;

/// Converts a foreign-owned object back to a Rust-owned one.
///
@@ -49,7 +49,7 @@ pub trait ForeignOwnable: Sized {
/// which a previous matching [`ForeignOwnable::from_foreign`] hasn't been called yet.
/// Additionally, all instances (if any) of values returned by [`ForeignOwnable::borrow`] for
/// this object must have been dropped.
- unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self;
+ unsafe fn from_foreign(ptr: *const crate::ffi::c_void) -> Self;

/// Tries to convert a foreign-owned object back to a Rust-owned one.
///
@@ -60,7 +60,7 @@ pub trait ForeignOwnable: Sized {
///
/// `ptr` must either be null or satisfy the safety requirements for
/// [`ForeignOwnable::from_foreign`].
- unsafe fn try_from_foreign(ptr: *const core::ffi::c_void) -> Option<Self> {
+ unsafe fn try_from_foreign(ptr: *const crate::ffi::c_void) -> Option<Self> {
if ptr.is_null() {
None
} else {
@@ -74,11 +74,11 @@ unsafe fn try_from_foreign(ptr: *const core::ffi::c_void) -> Option<Self> {
impl<T: 'static> ForeignOwnable for Box<T> {
type Borrowed<'a> = &'a T;

- fn into_foreign(self) -> *const core::ffi::c_void {
+ fn into_foreign(self) -> *const crate::ffi::c_void {
Box::into_raw(self) as _
}

- unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> &'a T {
+ unsafe fn borrow<'a>(ptr: *const crate::ffi::c_void) -> &'a T {
// SAFETY: The safety requirements for this function ensure that the object is still alive,
// so it is safe to dereference the raw pointer.
// The safety requirements of `from_foreign` also ensure that the object remains alive for
@@ -86,7 +86,7 @@ unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> &'a T {
unsafe { &*ptr.cast() }
}

- unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self {
+ unsafe fn from_foreign(ptr: *const crate::ffi::c_void) -> Self {
// SAFETY: The safety requirements of this function ensure that `ptr` comes from a previous
// call to `Self::into_foreign`.
unsafe { Box::from_raw(ptr as _) }
@@ -96,12 +96,12 @@ unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self {
impl<T: 'static> ForeignOwnable for Pin<Box<T>> {
type Borrowed<'a> = Pin<&'a T>;

- fn into_foreign(self) -> *const core::ffi::c_void {
+ fn into_foreign(self) -> *const crate::ffi::c_void {
// SAFETY: We are still treating the box as pinned.
Box::into_raw(unsafe { Pin::into_inner_unchecked(self) }) as _
}

- unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> Pin<&'a T> {
+ unsafe fn borrow<'a>(ptr: *const crate::ffi::c_void) -> Pin<&'a T> {
// SAFETY: The safety requirements for this function ensure that the object is still alive,
// so it is safe to dereference the raw pointer.
// The safety requirements of `from_foreign` also ensure that the object remains alive for
@@ -112,7 +112,7 @@ unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> Pin<&'a T> {
unsafe { Pin::new_unchecked(r) }
}

- unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self {
+ unsafe fn from_foreign(ptr: *const crate::ffi::c_void) -> Self {
// SAFETY: The safety requirements of this function ensure that `ptr` comes from a previous
// call to `Self::into_foreign`.
unsafe { Pin::new_unchecked(Box::from_raw(ptr as _)) }
@@ -122,13 +122,13 @@ unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self {
impl ForeignOwnable for () {
type Borrowed<'a> = ();

- fn into_foreign(self) -> *const core::ffi::c_void {
+ fn into_foreign(self) -> *const crate::ffi::c_void {
core::ptr::NonNull::dangling().as_ptr()
}

- unsafe fn borrow<'a>(_: *const core::ffi::c_void) -> Self::Borrowed<'a> {}
+ unsafe fn borrow<'a>(_: *const crate::ffi::c_void) -> Self::Borrowed<'a> {}

- unsafe fn from_foreign(_: *const core::ffi::c_void) -> Self {}
+ unsafe fn from_foreign(_: *const crate::ffi::c_void) -> Self {}
}

/// Runs a cleanup function/closure when dropped.
diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs
index e9347cff99ab2..c746a1f1bb5ad 100644
--- a/rust/kernel/uaccess.rs
+++ b/rust/kernel/uaccess.rs
@@ -8,11 +8,11 @@
alloc::Flags,
bindings,
error::Result,
+ ffi::{c_ulong, c_void},
prelude::*,
types::{AsBytes, FromBytes},
};
use alloc::vec::Vec;
-use core::ffi::{c_ulong, c_void};
use core::mem::{size_of, MaybeUninit};

/// The type used for userspace addresses.
@@ -47,7 +47,7 @@
///
/// ```no_run
/// use alloc::vec::Vec;
-/// use core::ffi::c_void;
+/// use kernel::ffi::c_void;
/// use kernel::error::Result;
/// use kernel::uaccess::{UserPtr, UserSlice};
///
@@ -70,7 +70,7 @@
///
/// ```no_run
/// use alloc::vec::Vec;
-/// use core::ffi::c_void;
+/// use kernel::ffi::c_void;
/// use kernel::error::{code::EINVAL, Result};
/// use kernel::uaccess::{UserPtr, UserSlice};
///
diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 571ffa2e189ca..6f6c8d18ca2d1 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -249,7 +249,7 @@ mod __module_init {{
#[doc(hidden)]
#[no_mangle]
#[link_section = \".init.text\"]
- pub unsafe extern \"C\" fn init_module() -> core::ffi::c_int {{
+ pub unsafe extern \"C\" fn init_module() -> kernel::ffi::c_int {{
// SAFETY: This function is inaccessible to the outside due to the double
// module wrapping it. It is called exactly once by the C side via its
// unique name.
@@ -288,7 +288,7 @@ mod __module_init {{
#[doc(hidden)]
#[link_section = \"{initcall_section}\"]
#[used]
- pub static __{name}_initcall: extern \"C\" fn() -> core::ffi::c_int = __{name}_init;
+ pub static __{name}_initcall: extern \"C\" fn() -> kernel::ffi::c_int = __{name}_init;

#[cfg(not(MODULE))]
#[cfg(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)]
@@ -303,7 +303,7 @@ mod __module_init {{
#[cfg(not(MODULE))]
#[doc(hidden)]
#[no_mangle]
- pub extern \"C\" fn __{name}_init() -> core::ffi::c_int {{
+ pub extern \"C\" fn __{name}_init() -> kernel::ffi::c_int {{
// SAFETY: This function is inaccessible to the outside due to the double
// module wrapping it. It is called exactly once by the C side via its
// placement above in the initcall section.
@@ -326,7 +326,7 @@ mod __module_init {{
/// # Safety
///
/// This function must only be called once.
- unsafe fn __init() -> core::ffi::c_int {{
+ unsafe fn __init() -> kernel::ffi::c_int {{
match <{type_} as kernel::Module>::init(&super::super::THIS_MODULE) {{
Ok(m) => {{
// SAFETY: No data race, since `__MOD` can only be accessed by this
--
2.44.1