From: Wei Liu <wei.liu2@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit 3f70fa828249e3f37883be98f5b4d08e947f55b0 upstream.
In preparation for adding event channel port ops, add
test_and_set_mask().
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/xen/events.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 767fe735abd7..bd12a6660fe3 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -370,6 +370,12 @@ static inline int test_evtchn(int port)
return sync_test_bit(port, BM(&s->evtchn_pending[0]));
}
+static inline int test_and_set_mask(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
+}
+
/**
* notify_remote_via_irq - send event to remote end of event channel via irq
@@ -1515,7 +1521,6 @@ void rebind_evtchn_irq(int evtchn, int irq)
/* Rebind an evtchn so that it gets delivered to a specific cpu */
static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
{
- struct shared_info *s = HYPERVISOR_shared_info;
struct evtchn_bind_vcpu bind_vcpu;
int evtchn = evtchn_from_irq(irq);
int masked;
@@ -1538,7 +1543,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
* Mask the event while changing the VCPU binding to prevent
* it being delivered on an unexpected VCPU.
*/
- masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
+ masked = test_and_set_mask(evtchn);
/*
* If this fails, it usually just indicates that we're dealing with a
@@ -1570,7 +1575,7 @@ int resend_irq_on_evtchn(unsigned int irq)
if (!VALID_EVTCHN(evtchn))
return 1;
- masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
+ masked = test_and_set_mask(evtchn);
sync_set_bit(evtchn, BM(s->evtchn_pending));
if (!masked)
unmask_evtchn(evtchn);
--
2.8.1
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