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UPSTREAM: vhost: introduce vhost_has_work()

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This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list. This could be used for busy
polling code to exit the busy loop.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 526d3e7ff5)
Bug: 121166534
Test: Ran cuttlefish with android-4.4 + VSOCKETS, VMWARE_VMCI_VSOCKETS
Signed-off-by: Alistair Strachan <astrachan@google.com>

Change-Id: I2717a212f888b0d3ea78f1ce0bcc21ec9dee5050
This commit is contained in:
Jason Wang
2016-03-04 06:24:51 -05:00
committed by Alistair Strachan
parent a5de7503e9
commit 2dd59f910b
2 changed files with 8 additions and 0 deletions
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7
drivers/vhost/vhost.c
View File

@@ -263,6 +263,13 @@ 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);

1
drivers/vhost/vhost.h
View File

@@ -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);