summaryrefslogtreecommitdiff
path: root/drivers/clocksource
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/hyperv_timer.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 06984fa11936..10eb5c645141 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -423,6 +423,30 @@ static struct clocksource hyperv_cs_msr = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
+/*
+ * Reference to pv_ops must be inline so objtool
+ * detection of noinstr violations can work correctly.
+ */
+#ifdef CONFIG_GENERIC_SCHED_CLOCK
+static __always_inline void hv_setup_sched_clock(void *sched_clock)
+{
+ /*
+ * We're on an architecture with generic sched clock (not x86/x64).
+ * The Hyper-V sched clock read function returns nanoseconds, not
+ * the normal 100ns units of the Hyper-V synthetic clock.
+ */
+ sched_clock_register(sched_clock, 64, NSEC_PER_SEC);
+}
+#elif defined CONFIG_PARAVIRT
+static __always_inline void hv_setup_sched_clock(void *sched_clock)
+{
+ /* We're on x86/x64 *and* using PV ops */
+ pv_ops.time.sched_clock = sched_clock;
+}
+#else /* !CONFIG_GENERIC_SCHED_CLOCK && !CONFIG_PARAVIRT */
+static __always_inline void hv_setup_sched_clock(void *sched_clock) {}
+#endif /* CONFIG_GENERIC_SCHED_CLOCK */
+
static bool __init hv_init_tsc_clocksource(void)
{
u64 tsc_msr;