rust: time: Add ktime_get() to ClockSource trait

Introduce the ktime_get() associated function to the ClockSource
trait, allowing each clock source to specify how it retrieves the
current time. This enables Instant::now() to be implemented
generically using the type-level ClockSource abstraction.

This change enhances the type safety and extensibility of timekeeping
by statically associating time retrieval mechanisms with their
respective clock types. It also reduces the reliance on hardcoded
clock logic within Instant.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250610093258.3435874-4-fujita.tomonori@gmail.com
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/rust/helpers/time.c b/rust/helpers/time.c
index 3d31473bce08..08755db43fc2 100644
--- a/rust/helpers/time.c
+++ b/rust/helpers/time.c
@@ -1,6 +1,22 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/ktime.h>
+#include <linux/timekeeping.h>
+
+ktime_t rust_helper_ktime_get_real(void)
+{
+	return ktime_get_real();
+}
+
+ktime_t rust_helper_ktime_get_boottime(void)
+{
+	return ktime_get_boottime();
+}
+
+ktime_t rust_helper_ktime_get_clocktai(void)
+{
+	return ktime_get_clocktai();
+}
 
 s64 rust_helper_ktime_to_us(const ktime_t kt)
 {