linux-kernel - [PATCH net-next v3 4/8] rust: time: Implement addition of Ktime and Delta

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Message-ID: <20241016035214.2229-5-fujita.tomonori@gmail.com>
Date: Wed, 16 Oct 2024 12:52:09 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: rust-for-linux@...r.kernel.org,
	andrew@...n.ch,
	hkallweit1@...il.com,
	tmgross@...ch.edu,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
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	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
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	frederic@...nel.org,
	tglx@...utronix.de,
	arnd@...db.de,
	jstultz@...gle.com,
	sboyd@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next v3 4/8] rust: time: Implement addition of Ktime and Delta

Implement Add<Delta> for Ktime to support the operation:

Ktime = Ktime + Delta

This is typically used to calculate the future time when the timeout
will occur.

timeout Ktime = current Ktime (via ktime_get()) + Delta;
// do something
if (ktime_get() > timeout Ktime) {
    // timed out
}

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
---
 rust/kernel/time.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 8c00854db58c..9b0537b63cf7 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -155,3 +155,14 @@ pub fn as_secs(self) -> i64 {
         self.nanos / NSEC_PER_SEC
     }
 }
+
+impl core::ops::Add<Delta> for Ktime {
+    type Output = Ktime;
+
+    #[inline]
+    fn add(self, delta: Delta) -> Ktime {
+        Ktime {
+            inner: self.inner + delta.as_nanos(),
+        }
+    }
+}
-- 
2.43.0