[PATCH v3 1/3] rust: time: rename the rem_nanos() divisor

[chenhan]

The argument to rem_nanos() is the divisor, while self holds the
dividend. Rename the argument and correct the documentation. Drop the
architecture-specific implementation explanation from the public API
documentation; the argument type already states the divisor's width.

This does not change the function's type or behavior. It is a preparation
for documenting and checking the invalid divisors in the next patch.

Cc: stable@xxxxxxxxxxxxxxx # prerequisite for the Delta division/remainder fix
Assisted-by: LLM
Signed-off-by: chenhan <chenhan0017.work@xxxxxxxxx>
---
 rust/kernel/time.rs | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 5ae377e70dd8..16b44e82d2ac 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -614,16 +614,13 @@ pub fn to_jiffies_timeout(self) -> Delta<Jiffy> {
         Delta::<Jiffy>::from_jiffies(jiffies)
     }
 
-    /// Return `self % dividend` where `dividend` is in nanoseconds.
-    ///
-    /// The kernel doesn't have any emulation for `s64 % s64` on 32 bit platforms, so this is
-    /// limited to 32 bit dividends.
+    /// Return `self % divisor` where `divisor` is in nanoseconds.
     #[inline]
-    pub fn rem_nanos(self, dividend: i32) -> Self {
+    pub fn rem_nanos(self, divisor: i32) -> Self {
         #[cfg(CONFIG_64BIT)]
         {
             Self {
-                value: self.as_nanos() % i64::from(dividend),
+                value: self.as_nanos() % i64::from(divisor),
             }
         }
 
@@ -632,7 +629,7 @@ pub fn rem_nanos(self, dividend: i32) -> Self {
             let mut rem = 0;
 
             // SAFETY: `rem` is in the stack, so we can always provide a valid pointer to it.
-            unsafe { bindings::div_s64_rem(self.as_nanos(), dividend, &mut rem) };
+            unsafe { bindings::div_s64_rem(self.as_nanos(), divisor, &mut rem) };
 
             Self {
                 value: i64::from(rem),
-- 
2.34.1