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| author | Jason Wang | 2016-03-04 12:24:51 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin | 2016-03-11 01:18:45 +0100 |
| commit | 526d3e7ff515582eaf7cf5d9da2a11bf681204e6 (patch) | |
| tree | 0f8cb97f616c8b09c1c8dd90530006581b26a3da /drivers/vhost/vhost.c | |
| parent | virtio_balloon: Allow to resize and update the balloon stats in parallel (diff) | |
| download | kernel-qcow2-linux-526d3e7ff515582eaf7cf5d9da2a11bf681204e6.tar.gz kernel-qcow2-linux-526d3e7ff515582eaf7cf5d9da2a11bf681204e6.tar.xz kernel-qcow2-linux-526d3e7ff515582eaf7cf5d9da2a11bf681204e6.zip | |
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. 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>
Diffstat (limited to 'drivers/vhost/vhost.c')
| -rw-r--r-- | drivers/vhost/vhost.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 328c54ab0154..596de212fe7e 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -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); |