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Message-Id: <1448951985-12385-2-git-send-email-jasowang@redhat.com>
Date: Tue, 1 Dec 2015 14:39:43 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Jason Wang <jasowang@...hat.com>
Subject: [PATCH V2 1/3] vhost: introduce vhost_has_work()
This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list.
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
drivers/vhost/vhost.c | 7 +++++++
drivers/vhost/vhost.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index eec2f11..163b365 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -245,6 +245,13 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
}
EXPORT_SYMBOL_GPL(vhost_work_queue);
+/* A lockless hint for busy polling code to exit the loop */
+bool vhost_has_work(struct vhost_dev *dev)
+{
+ return !list_empty(&dev->work_list);
+}
+EXPORT_SYMBOL_GPL(vhost_has_work);
+
void vhost_poll_queue(struct vhost_poll *poll)
{
vhost_work_queue(poll->dev, &poll->work);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index d3f7674..43284ad 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -37,6 +37,7 @@ struct vhost_poll {
void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
+bool vhost_has_work(struct vhost_dev *dev);
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
unsigned long mask, struct vhost_dev *dev);
--
2.5.0
--
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