linux-kernel - [PATCH v2 01/14] rust: time: Add Ktime::from

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Message-ID: <20240917222739.1298275-2-a.hindborg@kernel.org>
Date: Wed, 18 Sep 2024 00:27:25 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Lyude Paul <lyude@...hat.com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Alice Ryhl <aliceryhl@...gle.com>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/14] rust: time: Add Ktime::from_ns()

From: Lyude Paul <lyude@...hat.com>

A simple function to turn the provided value in nanoseconds into a Ktime
value. We allow any type which implements Into<bindings::ktime_t>, which
resolves to Into<i64>.

This is useful for some of the older DRM APIs that never got moved to Ktime

Signed-off-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/time.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index e3bb5e89f88d..1e02eee09f22 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -8,6 +8,8 @@
 //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
 //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
 
+use core::convert::Into;
+
 /// The number of nanoseconds per millisecond.
 pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
 
@@ -63,6 +65,12 @@ pub fn to_ns(self) -> i64 {
     pub fn to_ms(self) -> i64 {
         self.divns_constant::<NSEC_PER_MSEC>()
     }
+
+    /// Creates a new Ktime from the given duration in nanoseconds
+    #[inline]
+    pub fn from_ns(ns: impl Into<bindings::ktime_t>) -> Self {
+        Self { inner: ns.into() }
+    }
 }
 
 /// Returns the number of milliseconds between two ktimes.
-- 
2.46.0