linux-kernel - [PATCH 3.12 46/78] xen/events: introduce test_and_set

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Date:	Fri, 22 Apr 2016 13:05:29 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Wei Liu <wei.liu2@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 46/78] xen/events: introduce test_and_set_mask()

From: Wei Liu <wei.liu2@...rix.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 3f70fa828249e3f37883be98f5b4d08e947f55b0 upstream.

In preparation for adding event channel port ops, add
test_and_set_mask().

Signed-off-by: Wei Liu <wei.liu2@...rix.com>
Signed-off-by: David Vrabel <david.vrabel@...rix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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