[PATCH v2 3/4] rust: workqueue: use Delta for enqueue_delayed's delay parameter

[FUJITA Tomonori <tomo@flapping.org>]

From: FUJITA Tomonori <fujita.tomonori@gmail.com>

enqueue_delayed() took a raw jiffies count (a plain c_ulong alias with
no type safety), so callers had to know on their own that the value
meant jiffies and convert to/from it themselves. This mirrors the
issue already fixed for CondVar's wait_interruptible_timeout().

Switch to Delta, the duration type already used elsewhere, so the
unit is part of the type instead of a caller convention.

Use as_jiffies_ceil() rather than a plain truncating conversion:
queue_delayed_work_on() treats a delay of 0 jiffies as "enqueue
immediately", so truncating a small nonzero Delta down to 0 would
silently turn a requested delay into no delay at all.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---
 rust/kernel/workqueue.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 7e253b6f299c..9022b22a83be 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -197,7 +197,7 @@
         Arc,
         LockClassKey, //
     },
-    time::Jiffies,
+    time::Delta,
     types::Opaque,
 };
 use core::{marker::PhantomData, ptr::NonNull};
@@ -303,7 +303,7 @@ pub fn enqueue<W, const ID: u64>(&self, w: W) -> W::EnqueueOutput
     /// This may fail if the work item is already enqueued in a workqueue.
     ///
     /// The work item will be submitted using `WORK_CPU_UNBOUND`.
-    pub fn enqueue_delayed<W, const ID: u64>(&self, w: W, delay: Jiffies) -> W::EnqueueOutput
+    pub fn enqueue_delayed<W, const ID: u64>(&self, w: W, delay: Delta) -> W::EnqueueOutput
     where
         W: RawDelayedWorkItem<ID> + Send + 'static,
     {
@@ -328,7 +328,7 @@ pub fn enqueue_delayed<W, const ID: u64>(&self, w: W, delay: Jiffies) -> W::Enqu
                     bindings::wq_misc_consts_WORK_CPU_UNBOUND as ffi::c_int,
                     queue_ptr,
                     container_of!(work_ptr, bindings::delayed_work, work),
-                    delay,
+                    delay.as_jiffies_ceil(),
                 )
             })
         }
-- 
2.43.0