mirror of
https://github.com/torvalds/linux
synced 2024-09-16 00:58:07 +00:00
7b1f55e3a9
This allows us to have data protected by a lock despite not being wrapped by it. Access is granted by providing evidence that the lock is held by the caller. Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Link: https://lore.kernel.org/r/20230411054543.21278-13-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
//! Synchronisation primitives.
|
|
//!
|
|
//! This module contains the kernel APIs related to synchronisation that have been ported or
|
|
//! wrapped for usage by Rust code in the kernel.
|
|
|
|
use crate::types::Opaque;
|
|
|
|
mod arc;
|
|
pub mod lock;
|
|
mod locked_by;
|
|
|
|
pub use arc::{Arc, ArcBorrow, UniqueArc};
|
|
pub use lock::{mutex::Mutex, spinlock::SpinLock};
|
|
pub use locked_by::LockedBy;
|
|
|
|
/// Represents a lockdep class. It's a wrapper around C's `lock_class_key`.
|
|
#[repr(transparent)]
|
|
pub struct LockClassKey(Opaque<bindings::lock_class_key>);
|
|
|
|
// SAFETY: `bindings::lock_class_key` is designed to be used concurrently from multiple threads and
|
|
// provides its own synchronization.
|
|
unsafe impl Sync for LockClassKey {}
|
|
|
|
impl LockClassKey {
|
|
/// Creates a new lock class key.
|
|
pub const fn new() -> Self {
|
|
Self(Opaque::uninit())
|
|
}
|
|
|
|
pub(crate) fn as_ptr(&self) -> *mut bindings::lock_class_key {
|
|
self.0.get()
|
|
}
|
|
}
|
|
|
|
/// Defines a new static lock class and returns a pointer to it.
|
|
#[doc(hidden)]
|
|
#[macro_export]
|
|
macro_rules! static_lock_class {
|
|
() => {{
|
|
static CLASS: $crate::sync::LockClassKey = $crate::sync::LockClassKey::new();
|
|
&CLASS
|
|
}};
|
|
}
|
|
|
|
/// Returns the given string, if one is provided, otherwise generates one based on the source code
|
|
/// location.
|
|
#[doc(hidden)]
|
|
#[macro_export]
|
|
macro_rules! optional_name {
|
|
() => {
|
|
$crate::c_str!(::core::concat!(::core::file!(), ":", ::core::line!()))
|
|
};
|
|
($name:literal) => {
|
|
$crate::c_str!($name)
|
|
};
|
|
}
|