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FROMGIT: rust: sync: condvar: Add wait_interruptible_freezable()

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To support waiting for a `CondVar` as a freezable process, add a
wait_interruptible_freezable() function.

Binder needs this function in the appropriate places to freeze a process
where some of its threads are blocked on the Binder driver.

[Boqun: Capitalize the title and reword the commit log]

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20250204-condvar-freeze-v2-1-804483096260@google.com

Bug: 388786466
(cherry picked from commit 39dfd06783c0e256f420695ea85d95a5f471bc22
 git://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git lockdep-for-tip)
Change-Id: I04c41d20868898a3371ebafa54e4afb76edc762e
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
This commit is contained in:
Alice Ryhl
2025-02-04 13:43:25 +00:00
parent e7e5a051c8
commit a3803debda
2 changed files with 24 additions and 1 deletions
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rust/kernel/task.rs
+2
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@@ -23,6 +23,8 @@ pub const MAX_SCHEDULE_TIMEOUT: c_long = c_long::MAX;
pub const TASK_INTERRUPTIBLE: c_int = bindings::TASK_INTERRUPTIBLE as c_int;
/// Bitmask for tasks that are sleeping in an uninterruptible state.
pub const TASK_UNINTERRUPTIBLE: c_int = bindings::TASK_UNINTERRUPTIBLE as c_int;
/// Bitmask for tasks that are sleeping in a freezable state.
pub const TASK_FREEZABLE: c_int = bindings::TASK_FREEZABLE as c_int;
/// Convenience constant for waking up tasks regardless of whether they are in interruptible or
/// uninterruptible sleep.
pub const TASK_NORMAL: c_uint = bindings::TASK_NORMAL as c_uint;