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Subject[PATCH] Time: Delay clocksource selection until later in boot
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	Delay installing new clocksources until later in boot. This avoids some
of the clocksource churn that can occur at boot, possibly allowing the
system to run for a brief time with a bad clocksource.

This patch resolves the boot time stalls seen by Mattia Dongili.

thanks
-john

Signed-off-by: John Stultz <johnstul@us.ibm.com>


diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -51,13 +51,27 @@ static LIST_HEAD(clocksource_list);
static DEFINE_SPINLOCK(clocksource_lock);
static char override_name[32];

+static int finished_booting;
+
+/* clocksource_done_booting - Called near the end of bootup
+ *
+ * Hack to avoid lots of clocksource churn at boot time
+ */
+static int clocksource_done_booting(void)
+{
+ finished_booting = 1;
+ return 0;
+}
+
+late_initcall(clocksource_done_booting);
+
/**
* get_next_clocksource - Returns the selected clocksource
*/
struct clocksource *get_next_clocksource(void)
{
spin_lock(&clocksource_lock);
- if (next_clocksource) {
+ if (next_clocksource && finished_booting) {
curr_clocksource = next_clocksource;
next_clocksource = NULL;
}

-
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