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authorWei Liu <wei.liu2@citrix.com>2013-03-07 15:50:27 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 10:07:35 -0500
commit3f70fa828249e3f37883be98f5b4d08e947f55b0 (patch)
tree2e4d738d40aea11c302b40a31e121a23c9f6bbcc /drivers/xen
parentfc087e10734a4d3e40693fc099461ec1270b3fff (diff)
downloadlinux-3f70fa828249e3f37883be98f5b4d08e947f55b0.tar.bz2
xen/events: introduce test_and_set_mask()
In preparation for adding event channel port ops, add test_and_set_mask(). Signed-off-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 1e2c74bcd0c8..359e983d97e4 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -352,6 +352,12 @@ 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
@@ -1493,7 +1499,6 @@ 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;
@@ -1516,7 +1521,7 @@ 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
@@ -1548,7 +1553,7 @@ static int retrigger_evtchn(int evtchn)
if (!VALID_EVTCHN(evtchn))
return 0;
- 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);