[PATCH net-next v3 3/8] rust: time: Change output of Ktime's sub operation to Delta

[FUJITA Tomonori]

Change the output type of Ktime's subtraction operation from Ktime to
Delta. Currently, the output is Ktime:

Ktime = Ktime - Ktime

It means that Ktime is used to represent timedelta. Delta is
introduced so use it. A typical example is calculating the elapsed
time:

Delta = current Ktime - past Ktime;

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>
---
 rust/kernel/time.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 38a70dc98083..8c00854db58c 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -74,16 +74,16 @@ pub fn to_ms(self) -> i64 {
 /// Returns the number of milliseconds between two ktimes.
 #[inline]
 pub fn ktime_ms_delta(later: Ktime, earlier: Ktime) -> i64 {
-    (later - earlier).to_ms()
+    (later - earlier).as_millis()
 }
 
 impl core::ops::Sub for Ktime {
-    type Output = Ktime;
+    type Output = Delta;
 
     #[inline]
-    fn sub(self, other: Ktime) -> Ktime {
-        Self {
-            inner: self.inner - other.inner,
+    fn sub(self, other: Ktime) -> Delta {
+        Delta {
+            nanos: self.inner - other.inner,
         }
     }
 }
-- 
2.43.0