[Xen-devel] [PATCH] Xen/timer: Disable watchdog during dumping timer queues

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On a machine with a mount of cpus, dump_timerq() lasts several seconds
which may exceed watchdog timeout and cause Xen hyperviosr reboot.
This patch is to disable watchdog when dump timer queues to fix the
issue.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/common/timer.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/common/timer.c b/xen/common/timer.c
index 29a60a9..2d9d828 100644
--- a/xen/common/timer.c
+++ b/xen/common/timer.c
@@ -21,6 +21,7 @@
 #include <xen/cpu.h>
 #include <xen/rcupdate.h>
 #include <xen/symbols.h>
+#include <xen/watchdog.h>
 #include <asm/system.h>
 #include <asm/desc.h>
 #include <asm/atomic.h>
@@ -524,6 +525,7 @@ static void dump_timerq(unsigned char key)
     s_time_t       now = NOW();
     int            i, j;
 
+    watchdog_disable();
     printk("Dumping timer queues:\n");
 
     for_each_online_cpu( i )
@@ -538,6 +540,8 @@ static void dump_timerq(unsigned char key)
             dump_timer(t, now);
         spin_unlock_irqrestore(&ts->lock, flags);
     }
+
+    watchdog_enable();
 }
 
 static void migrate_timers_from_cpu(unsigned int old_cpu)
-- 
1.7.1


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