xen: statically initialize cpu_evtchn_mask_p

Sometimes cpu_evtchn_mask_p can get used early, before it has been
allocated.  Statically initialize it with an initdata version to catch
any early references.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 0fcfb4a1ceab..1e39908d02f9 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -104,7 +104,12 @@ static int *evtchn_to_irq;
 struct cpu_evtchn_s {
         unsigned long bits[NR_EVENT_CHANNELS/BITS_PER_LONG];
 };
-static struct cpu_evtchn_s *cpu_evtchn_mask_p;
+
+static __initdata struct cpu_evtchn_s init_evtchn_mask = {
+        .bits[0 ... (NR_EVENT_CHANNELS/BITS_PER_LONG)-1] = ~0ul,
+};
+static struct cpu_evtchn_s *cpu_evtchn_mask_p = &init_evtchn_mask;
+
 static inline unsigned long *cpu_evtchn_mask(int cpu)
 {
         return cpu_evtchn_mask_p[cpu].bits;