diff options
| author | Maxime Ripard <mripard@kernel.org> | 2023-07-11 09:23:20 +0200 |
|---|---|---|
| committer | Maxime Ripard <mripard@kernel.org> | 2023-07-11 09:23:20 +0200 |
| commit | 2f98e686ef59b5d19af5847d755798e2031bee3a (patch) | |
| tree | 7b47919242853d088decf898ca79d6cda0d49381 /rust/kernel/task.rs | |
| parent | a2848d08742c8e8494675892c02c0d22acbe3cf8 (diff) | |
| parent | 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5 (diff) | |
| download | lwn-2f98e686ef59b5d19af5847d755798e2031bee3a.tar.gz lwn-2f98e686ef59b5d19af5847d755798e2031bee3a.zip | |
Merge v6.5-rc1 into drm-misc-fixes
Boris needs 6.5-rc1 in drm-misc-fixes to prevent a conflict.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'rust/kernel/task.rs')
| -rw-r--r-- | rust/kernel/task.rs | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/rust/kernel/task.rs b/rust/kernel/task.rs index 526d29a0ae27..7eda15e5f1b3 100644 --- a/rust/kernel/task.rs +++ b/rust/kernel/task.rs @@ -64,8 +64,14 @@ macro_rules! current { #[repr(transparent)] pub struct Task(pub(crate) Opaque<bindings::task_struct>); -// SAFETY: It's OK to access `Task` through references from other threads because we're either -// accessing properties that don't change (e.g., `pid`, `group_leader`) or that are properly +// SAFETY: By design, the only way to access a `Task` is via the `current` function or via an +// `ARef<Task>` obtained through the `AlwaysRefCounted` impl. This means that the only situation in +// which a `Task` can be accessed mutably is when the refcount drops to zero and the destructor +// runs. It is safe for that to happen on any thread, so it is ok for this type to be `Send`. +unsafe impl Send for Task {} + +// SAFETY: It's OK to access `Task` through shared references from other threads because we're +// either accessing properties that don't change (e.g., `pid`, `group_leader`) or that are properly // synchronised by C code (e.g., `signal_pending`). unsafe impl Sync for Task {} |