microblaze: Improve ftrace time measuring

I had to comment sched_clock generic function because of broken toolchain.
It is fine grain timing.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index ed61b2f17719..22e296eb871b 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -235,6 +235,12 @@ static int __init microblaze_clocksource_init(void)
         return 0;
 }
 
+/*
+ * We have to protect accesses before timer initialization
+ * and return 0 for sched_clock function below.
+ */
+static int timer_initialized;
+
 void __init time_init(void)
 {
         u32 irq, i = 0;
@@ -289,4 +295,15 @@ void __init time_init(void)
 #endif
         microblaze_clocksource_init();
         microblaze_clockevent_init();
+        timer_initialized = 1;
+}
+
+unsigned long long notrace sched_clock(void)
+{
+        if (timer_initialized) {
+                struct clocksource *cs = &clocksource_microblaze;
+                cycle_t cyc = cs->read(NULL);
+                return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+        }
+        return 0;
 }