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Message-ID: <20240816001216.26575-12-dakr@kernel.org>
Date: Fri, 16 Aug 2024 02:10:53 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: ojeda@...nel.org,
alex.gaynor@...il.com,
wedsonaf@...il.com,
boqun.feng@...il.com,
gary@...yguo.net,
bjorn3_gh@...tonmail.com,
benno.lossin@...ton.me,
a.hindborg@...sung.com,
aliceryhl@...gle.com,
akpm@...ux-foundation.org
Cc: daniel.almeida@...labora.com,
faith.ekstrand@...labora.com,
boris.brezillon@...labora.com,
lina@...hilina.net,
mcanal@...lia.com,
zhiw@...dia.com,
cjia@...dia.com,
jhubbard@...dia.com,
airlied@...hat.com,
ajanulgu@...hat.com,
lyude@...hat.com,
linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org,
linux-mm@...ck.org,
Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH v6 11/26] rust: alloc: remove `BoxExt` extension
Now that all existing `Box` users were moved to the kernel `Box` type,
remove the `BoxExt` extension and all other related extensions.
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
rust/kernel/alloc.rs | 1 -
rust/kernel/alloc/box_ext.rs | 80 ------------------------------------
rust/kernel/init.rs | 44 +-------------------
rust/kernel/lib.rs | 1 -
rust/kernel/prelude.rs | 4 +-
rust/kernel/types.rs | 28 -------------
6 files changed, 3 insertions(+), 155 deletions(-)
delete mode 100644 rust/kernel/alloc/box_ext.rs
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index 0c9bb60250af..d248390345ec 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -4,7 +4,6 @@
#[cfg(not(any(test, testlib)))]
pub mod allocator;
-pub mod box_ext;
pub mod kbox;
pub mod vec_ext;
diff --git a/rust/kernel/alloc/box_ext.rs b/rust/kernel/alloc/box_ext.rs
deleted file mode 100644
index 076d5de5f47d..000000000000
--- a/rust/kernel/alloc/box_ext.rs
+++ /dev/null
@@ -1,80 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-//! Extensions to [`Box`] for fallible allocations.
-
-use super::{AllocError, Flags};
-use alloc::boxed::Box;
-use core::{mem::MaybeUninit, ptr, result::Result};
-
-/// Extensions to [`Box`].
-pub trait BoxExt<T>: Sized {
- /// Allocates a new box.
- ///
- /// The allocation may fail, in which case an error is returned.
- fn new(x: T, flags: Flags) -> Result<Self, AllocError>;
-
- /// Allocates a new uninitialised box.
- ///
- /// The allocation may fail, in which case an error is returned.
- fn new_uninit(flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError>;
-
- /// Drops the contents, but keeps the allocation.
- ///
- /// # Examples
- ///
- /// ```
- /// use kernel::alloc::{flags, box_ext::BoxExt};
- /// let value = Box::new([0; 32], flags::GFP_KERNEL)?;
- /// assert_eq!(*value, [0; 32]);
- /// let value = Box::drop_contents(value);
- /// // Now we can re-use `value`:
- /// let value = Box::write(value, [1; 32]);
- /// assert_eq!(*value, [1; 32]);
- /// # Ok::<(), Error>(())
- /// ```
- fn drop_contents(this: Self) -> Box<MaybeUninit<T>>;
-}
-
-impl<T> BoxExt<T> for Box<T> {
- fn new(x: T, flags: Flags) -> Result<Self, AllocError> {
- let b = <Self as BoxExt<_>>::new_uninit(flags)?;
- Ok(Box::write(b, x))
- }
-
- #[cfg(any(test, testlib))]
- fn new_uninit(_flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError> {
- Ok(Box::new_uninit())
- }
-
- #[cfg(not(any(test, testlib)))]
- fn new_uninit(flags: Flags) -> Result<Box<MaybeUninit<T>>, AllocError> {
- let ptr = if core::mem::size_of::<MaybeUninit<T>>() == 0 {
- core::ptr::NonNull::<_>::dangling().as_ptr()
- } else {
- let layout = core::alloc::Layout::new::<MaybeUninit<T>>();
-
- // SAFETY: Memory is being allocated (first arg is null). The only other source of
- // safety issues is sleeping on atomic context, which is addressed by klint. Lastly,
- // the type is not a SZT (checked above).
- let ptr =
- unsafe { super::allocator::krealloc_aligned(core::ptr::null_mut(), layout, flags) };
- if ptr.is_null() {
- return Err(AllocError);
- }
-
- ptr.cast::<MaybeUninit<T>>()
- };
-
- // SAFETY: For non-zero-sized types, we allocate above using the global allocator. For
- // zero-sized types, we use `NonNull::dangling`.
- Ok(unsafe { Box::from_raw(ptr) })
- }
-
- fn drop_contents(this: Self) -> Box<MaybeUninit<T>> {
- let ptr = Box::into_raw(this);
- // SAFETY: `ptr` is valid, because it came from `Box::into_raw`.
- unsafe { ptr::drop_in_place(ptr) };
- // SAFETY: `ptr` is valid, because it came from `Box::into_raw`.
- unsafe { Box::from_raw(ptr.cast()) }
- }
-}
diff --git a/rust/kernel/init.rs b/rust/kernel/init.rs
index 0646546d9356..72452ddc0606 100644
--- a/rust/kernel/init.rs
+++ b/rust/kernel/init.rs
@@ -211,12 +211,11 @@
//! [`pin_init!`]: crate::pin_init!
use crate::{
- alloc::{box_ext::BoxExt, AllocError, Flags, KBox},
+ alloc::{AllocError, Flags, KBox},
error::{self, Error},
sync::UniqueArc,
types::{Opaque, ScopeGuard},
};
-use alloc::boxed::Box;
use core::{
cell::UnsafeCell,
convert::Infallible,
@@ -589,7 +588,6 @@ macro_rules! pin_init {
/// # Examples
///
/// ```rust
-/// # #![feature(new_uninit)]
/// use kernel::{init::{self, PinInit}, error::Error};
/// #[pin_data]
/// struct BigBuf {
@@ -1149,24 +1147,6 @@ fn init<E>(init: impl Init<T, E>, flags: Flags) -> error::Result<Self>
}
}
-impl<T> InPlaceInit<T> for Box<T> {
- #[inline]
- fn try_pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> Result<Pin<Self>, E>
- where
- E: From<AllocError>,
- {
- <Box<_> as BoxExt<_>>::new_uninit(flags)?.write_pin_init(init)
- }
-
- #[inline]
- fn try_init<E>(init: impl Init<T, E>, flags: Flags) -> Result<Self, E>
- where
- E: From<AllocError>,
- {
- <Box<_> as BoxExt<_>>::new_uninit(flags)?.write_init(init)
- }
-}
-
impl<T> InPlaceInit<T> for UniqueArc<T> {
#[inline]
fn try_pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> Result<Pin<Self>, E>
@@ -1201,28 +1181,6 @@ pub trait InPlaceWrite<T> {
fn write_pin_init<E>(self, init: impl PinInit<T, E>) -> Result<Pin<Self::Initialized>, E>;
}
-impl<T> InPlaceWrite<T> for Box<MaybeUninit<T>> {
- type Initialized = Box<T>;
-
- fn write_init<E>(mut self, init: impl Init<T, E>) -> Result<Self::Initialized, E> {
- let slot = self.as_mut_ptr();
- // SAFETY: When init errors/panics, slot will get deallocated but not dropped,
- // slot is valid.
- unsafe { init.__init(slot)? };
- // SAFETY: All fields have been initialized.
- Ok(unsafe { self.assume_init() })
- }
-
- fn write_pin_init<E>(mut self, init: impl PinInit<T, E>) -> Result<Pin<Self::Initialized>, E> {
- let slot = self.as_mut_ptr();
- // SAFETY: When init errors/panics, slot will get deallocated but not dropped,
- // slot is valid and will not be moved, because we pin it later.
- unsafe { init.__pinned_init(slot)? };
- // SAFETY: All fields have been initialized.
- Ok(unsafe { self.assume_init() }.into())
- }
-}
-
impl<T> InPlaceWrite<T> for UniqueArc<MaybeUninit<T>> {
type Initialized = UniqueArc<T>;
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index a10d0e140ab1..4599bd06b1e6 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -14,7 +14,6 @@
#![no_std]
#![feature(coerce_unsized)]
#![feature(dispatch_from_dyn)]
-#![feature(new_uninit)]
#![feature(receiver_trait)]
#![feature(unsize)]
diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
index a9210634a8c3..c1f8e5c832e2 100644
--- a/rust/kernel/prelude.rs
+++ b/rust/kernel/prelude.rs
@@ -14,10 +14,10 @@
#[doc(no_inline)]
pub use core::pin::Pin;
-pub use crate::alloc::{box_ext::BoxExt, flags::*, vec_ext::VecExt, KBox, KVBox, VBox};
+pub use crate::alloc::{flags::*, vec_ext::VecExt, KBox, KVBox, VBox};
#[doc(no_inline)]
-pub use alloc::{boxed::Box, vec::Vec};
+pub use alloc::vec::Vec;
#[doc(no_inline)]
pub use macros::{module, pin_data, pinned_drop, vtable, Zeroable};
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 9b9e9b913d1c..234b615662a2 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -3,7 +3,6 @@
//! Kernel types.
use crate::init::{self, PinInit};
-use alloc::boxed::Box;
use core::{
cell::UnsafeCell,
marker::{PhantomData, PhantomPinned},
@@ -105,33 +104,6 @@ unsafe fn try_from_foreign(ptr: *const core::ffi::c_void) -> Option<Self> {
unsafe fn borrow_mut<'a>(ptr: *const core::ffi::c_void) -> Self::BorrowedMut<'a>;
}
-impl<T: 'static> ForeignOwnable for Box<T> {
- type Borrowed<'a> = &'a T;
- type BorrowedMut<'a> = &'a mut T;
-
- fn into_foreign(self) -> *const core::ffi::c_void {
- Box::into_raw(self) as _
- }
-
- unsafe fn from_foreign(ptr: *const core::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 _) }
- }
-
- unsafe fn borrow<'a>(ptr: *const core::ffi::c_void) -> &'a T {
- // SAFETY: The safety requirements of this method ensure that the object remains alive and
- // immutable for the duration of 'a.
- unsafe { &*ptr.cast() }
- }
-
- unsafe fn borrow_mut<'a>(ptr: *const core::ffi::c_void) -> &'a mut T {
- // SAFETY: The safety requirements of this method ensure that the pointer is valid and that
- // nothing else will access the value for the duration of 'a.
- unsafe { &mut *ptr.cast_mut().cast() }
- }
-}
-
impl ForeignOwnable for () {
type Borrowed<'a> = ();
type BorrowedMut<'a> = ();
--
2.46.0
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