The latency tracer can call clocksource_read very early in bootup and
before the clock source variable has been initialized. This results in a
crash at boot up (even before earlyprintk is initialized). Since the
clock->read variable is points to NULL.
This patch simply initializes the clock to use clocksource_jiffies, so
that any early user of clocksource_read will not crash.
Signed-off-by: Steven Rostedt <[email protected]>
Index: linux-2.6-rt/kernel/time/timekeeping.c
===================================================================
--- linux-2.6-rt.orig/kernel/time/timekeeping.c 2007-08-24 11:38:11.000000000 -0400
+++ linux-2.6-rt/kernel/time/timekeeping.c 2007-08-24 13:41:03.000000000 -0400
@@ -43,7 +43,15 @@ struct timespec wall_to_monotonic __attr
EXPORT_SYMBOL(xtime);
-static struct clocksource *clock; /* pointer to current clocksource */
+extern struct clocksource clocksource_jiffies;
+
+/*
+ * pointer to current clocksource
+ * Just in case we use clocksource_read before we initialize
+ * the actual clock source. Instead of calling a NULL read pointer
+ * we return jiffies.
+ */
+static struct clocksource *clock = &clocksource_jiffies;
#ifdef CONFIG_GENERIC_TIME
-
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