[PATCH v5 0/7] rust: use Delta instead of raw jiffies for timeouts and delays

From: FUJITA Tomonori <[email protected]>

CondVar::wait_interruptible_timeout() and Queue::enqueue_delayed() use
a raw jiffies count (a plain c_ulong alias with no type
safety). Callers have to know on their own that the value meant
jiffies and convert to/from it themselves, which is easy to get wrong
(e.g. passing a millisecond value where a jiffies value is expected).

Both APIs just take a span of time so, they can use the Delta type
instead.

This series makes Delta generic over its time unit with Nsec and Jiffy
types, switches CondVar and Queue to use Delta instead of raw jiffies
(updating binder's ioctl_freeze(), the only caller of
wait_interruptible_timeout()), and then removes the now-unused Jiffies
and Msecs type aliases.

---
v5:
- Fix as_millis_ceil() rounding near i64::MAX
- Import Delta instead of using kernel::time::Delta twice
v4: https://lore.kernel.org/rust-for-linux/[email protected]/
- Make Delta generic over its time unit with Nsec and Jiffy types
v3: https://lore.kernel.org/rust-for-linux/[email protected]/
- Add new Jiffies type and convert the APIs to take impl Into<Jiffies>
v2: https://lore.kernel.org/rust-for-linux/[email protected]/
- Fix potential overflow in from_jiffies()
- Fix inflating bug in as_jiffies_ceil()
- Add a patch to convert enqueue_delayed()
- Add a patch to remove Jiffies/Msecs aliases
v1: https://lore.kernel.org/rust-for-linux/[email protected]/

---
FUJITA Tomonori (7):
  rust: time: make Delta generic over its time unit
  rust: time: add jiffies time unit for Delta
  rust: time: add Delta::as_millis_ceil()
  rust: time: add Delta::to_jiffies() for timeout conversion
  rust: workqueue: take a Delta<Jiffy> for the enqueue delay
  rust: sync: condvar: use Delta<Jiffy> for timeout and result
  rust: time: remove unused Jiffies/Msecs helpers

 drivers/android/binder/process.rs |   7 +-
 rust/kernel/sync/condvar.rs       |  29 ++++--
 rust/kernel/time.rs               | 159 +++++++++++++++++++++++-------
 rust/kernel/workqueue.rs          |  12 ++-
 4 files changed, 154 insertions(+), 53 deletions(-)


base-commit: dc01dfb37b34beeefcfe1c3055364d41a4070c7e
-- 
2.43.0