Messages in this thread Patch in this message | | | Subject | [PATCH RT 2/3] initialize the clock source to jiffies clock. | From | Steven Rostedt <> | Date | Fri, 24 Aug 2007 13:57:14 -0400 |
| |
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 <rostedt@goodmis.org>
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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |