x86, vmi: TSC going backwards check in vmi clocksource, cleanup

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / vmiclock_32.c

diff --git a/arch/x86/kernel/vmiclock_32.c b/arch/x86/kernel/vmiclock_32.c
index c4c1f9e094027089373189f7e57cb7ede8149be9..b77ad5789af9858ecfc60f959e5759dc9022866b 100644 (file)
--- a/arch/x86/kernel/vmiclock_32.c
+++ b/arch/x86/kernel/vmiclock_32.c
@@ -256,7 +256,7 @@ void __devinit vmi_time_bsp_init(void)
         */
        clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
        local_irq_disable();
-#ifdef CONFIG_X86_SMP
+#ifdef CONFIG_SMP
        /*
         * XXX handle_percpu_irq only defined for SMP; we need to switch over
         * to using it, since this is a local interrupt, which each CPU must
@@ -283,10 +283,12 @@ void __devinit vmi_time_ap_init(void)
 #endif
 
 /** vmi clocksource */
+static struct clocksource clocksource_vmi;
 
 static cycle_t read_real_cycles(void)
 {
-       return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
+       cycle_t ret = (cycle_t)vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
+       return max(ret, clocksource_vmi.cycle_last);
 }
 
 static struct clocksource clocksource_vmi = {