* [PATCH v4 15/15] rust: sync: add functions for initializing `UniqueArc<MaybeUninit<T>>`
@ 2023-03-31 21:54 y86-dev
0 siblings, 0 replies; only message in thread
From: y86-dev @ 2023-03-31 21:54 UTC (permalink / raw
To: Miguel Ojeda, Alex Gaynor, Wedson Almeida Filho, Boqun Feng,
Gary Guo, Björn Roy Baron, Alice Ryhl
Cc: rust-for-linux, linux-kernel, patches, Benno Lossin, Alice Ryhl,
Andreas Hindborg
From: Benno Lossin <y86-dev@protonmail.com>
Add two functions `init_with` and `pin_init_with` to
`UniqueArc<MaybeUninit<T>>` to initialize the memory of already allocated
`UniqueArc`s. This is useful when you want to allocate memory check some
condition inside of a context where allocation is forbidden and then
conditionally initialize an object.
Signed-off-by: Benno Lossin <y86-dev@protonmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
---
rust/kernel/sync/arc.rs | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index 5f64affd8f33..fddb7a2b1890 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -540,6 +540,30 @@ impl<T> UniqueArc<MaybeUninit<T>> {
inner: unsafe { Arc::from_inner(inner.cast()) },
}
}
+
+ /// Initialize `self` using the given initializer.
+ pub fn init_with<E>(mut self, init: impl Init<T, E>) -> core::result::Result<UniqueArc<T>, E> {
+ // SAFETY: The supplied pointer is valid for initialization.
+ match unsafe { init.__init(self.as_mut_ptr()) } {
+ // SAFETY: Initialization completed successfully.
+ Ok(()) => Ok(unsafe { self.assume_init() }),
+ Err(err) => Err(err),
+ }
+ }
+
+ /// Pin-initialize `self` using the given pin-initializer.
+ pub fn pin_init_with<E>(
+ mut self,
+ init: impl PinInit<T, E>,
+ ) -> core::result::Result<Pin<UniqueArc<T>>, E> {
+ // SAFETY: The supplied pointer is valid for initialization and we will later pin the value
+ // to ensure it does not move.
+ match unsafe { init.__pinned_init(self.as_mut_ptr()) } {
+ // SAFETY: Initialization completed successfully.
+ Ok(()) => Ok(unsafe { self.assume_init() }.into()),
+ Err(err) => Err(err),
+ }
+ }
}
impl<T: ?Sized> From<UniqueArc<T>> for Pin<UniqueArc<T>> {
--
2.39.2
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2023-03-31 21:54 [PATCH v4 15/15] rust: sync: add functions for initializing `UniqueArc<MaybeUninit<T>>` y86-dev
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