MFcalloutng:

When CPU becomes idle, cpu_idleclock() calculates time to the next timer
event in order to reprogram hw timer. Return that time in sbintime_t to
the caller and pass it to acpi_cpu_idle(), where it can be used as one
more factor (quite precise) to extimate furter sleep time and choose
optimal sleep state. This is a preparatory change for further callout
improvements will be committed in the next days.

The commmit is not targeted for MFC.

1 files changed, 4 insertions, 3 deletions

diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c
index 98bcf446d7a0..ac6a8291c92c 100644
--- a/sys/ia64/ia64/machdep.c
+++ b/sys/ia64/ia64/machdep.c
@@ -171,7 +171,7 @@ extern vm_offset_t ksym_start, ksym_end;
 struct msgbuf *msgbufp = NULL;
 
 /* Other subsystems (e.g., ACPI) can hook this later. */
-void (*cpu_idle_hook)(void) = NULL;
+void (*cpu_idle_hook)(sbintime_t) = NULL;
 
 struct kva_md_info kmi;
 
@@ -408,10 +408,11 @@ void
 cpu_idle(int busy)
 {
 	register_t ie;
+	sbintime_t sbt = -1;
 
 	if (!busy) {
 		critical_enter();
-		cpu_idleclock();
+		sbt = cpu_idleclock();
 	}
 
 	ie = intr_disable();
@@ -420,7 +421,7 @@ cpu_idle(int busy)
 	if (sched_runnable())
 		ia64_enable_intr();
 	else if (cpu_idle_hook != NULL) {
-		(*cpu_idle_hook)();
+		(*cpu_idle_hook)(sbt);
 		/* The hook must enable interrupts! */
 	} else {
 		ia64_call_pal_static(PAL_HALT_LIGHT, 0, 0, 0);