[PATCH 1/6] rust: time: Add Ktime::from_ns()

[Lyude Paul <lyude@redhat.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@redhat.com>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/time.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index f509cb0eb71e0..c05afda07a05f 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -1,5 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
-
+// SPDX-License-Identifier: GPL-2.0 
 //! Time related primitives.
 //!
 //! This module contains the kernel APIs related to time and timers that
@@ -9,6 +8,7 @@
 //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
 
 pub mod hrtimer;
+use core::convert::Into;
 
 /// The number of nanoseconds per millisecond.
 pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
@@ -65,6 +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_nanos(ns: impl Into<bindings::ktime_t>) -> Self {
+        Self { inner: ns.into() }
+    }
 }
 
 /// Returns the number of milliseconds between two ktimes.
-- 
2.48.1