pc_linux: enable NO_HZ_IDLE

the option enables support to stop periodic ticking when in idle task.

Adjust dummies of intel_fb, wifi, usb drivers accordingly.

Issue #4540

repos/pc/src/drivers/framebuffer/intel/pc/dummies.c

@@ -527,3 +527,27 @@ void intel_dsb_commit(const struct intel_crtc_state *crtc_state)
 {
 	lx_emul_trace(__func__);
 }
+
+
+void calc_load_nohz_start(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void calc_load_nohz_stop(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void account_idle_ticks(unsigned long ticks)
+{
+	lx_emul_trace(__func__);
+}
+
+
+bool irq_work_needs_cpu(void)
+{
+	return false;
+}

repos/pc/src/drivers/framebuffer/intel/pc/spec/x86_32/source.list

@@ -229,6 +229,8 @@ kernel/time/hrtimer.c
 kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/drivers/framebuffer/intel/pc/spec/x86_64/source.list

@@ -233,6 +233,8 @@ kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-broadcast.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/drivers/usb_host/pc/dummies.c

@@ -82,3 +82,27 @@ int __printk_ratelimit(const char * func)
 	/* suppress */
 	return 0;
 }
+
+
+void calc_load_nohz_start(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void calc_load_nohz_stop(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void account_idle_ticks(unsigned long ticks)
+{
+	lx_emul_trace(__func__);
+}
+
+
+bool irq_work_needs_cpu(void)
+{
+	return false;
+}

repos/pc/src/drivers/usb_host/pc/spec/x86_32/source.list

@@ -83,6 +83,8 @@ kernel/time/hrtimer.c
 kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/drivers/usb_host/pc/spec/x86_64/source.list

@@ -85,6 +85,8 @@ kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-broadcast.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/lib/wifi/dummies.c

@@ -294,3 +294,27 @@ int net_ratelimit(void)
 	/* suppress */
 	return 0;
 }
+
+
+void calc_load_nohz_start(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void calc_load_nohz_stop(void)
+{
+	lx_emul_trace(__func__);
+}
+
+
+void account_idle_ticks(unsigned long ticks)
+{
+	lx_emul_trace(__func__);
+}
+
+
+bool irq_work_needs_cpu(void)
+{
+	return false;
+}

repos/pc/src/lib/wifi/spec/x86_32/source.list

@@ -155,6 +155,8 @@ kernel/time/hrtimer.c
 kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/lib/wifi/spec/x86_64/source.list

@@ -156,6 +156,8 @@ kernel/time/jiffies.c
 kernel/time/ntp.c
 kernel/time/tick-broadcast.c
 kernel/time/tick-common.c
+kernel/time/tick-oneshot.c
+kernel/time/tick-sched.c
 kernel/time/time.c
 kernel/time/timeconv.c
 kernel/time/timecounter.c

repos/pc/src/pc_linux/target.inc

@@ -5,6 +5,9 @@
 # kernel fundamentals
 LX_ENABLE += TTY SERIAL_EARLYCON SERIAL_OF_PLATFORM PRINTK HAS_IOMEM
 
+# support disabling ticking during idle
+LX_ENABLE  += NO_HZ_IDLE
+
 # initrd support
 LX_ENABLE += BINFMT_ELF BINFMT_SCRIPT BLK_DEV_INITRD