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From: Daniel Kiper <dkiper@net-space.pl>
Subject: xen: disable clock timer when shutting down.
This is needed as some Amazon EC2 machines can't restart the timer
properly in the kexec-ed kernel, as jiffies are not being incremented.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/xen/time.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -289,7 +289,15 @@ static void xen_timerop_set_mode(enum cl
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
+#if 0
+ /*
+ * Disabled due to some Amazon EC2 machines are not able to
+ * restart timer properly in crash kernel. If this happens then
+ * it hangs in loop in calibrate_delay_direct() because jiffies
+ * are not incremented.
+ */
HYPERVISOR_set_timer_op(0); /* cancel timeout */
+#endif
break;
}
}
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