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Commit 526d3e7f authored by Jason Wang's avatar Jason Wang Committed by Michael S. Tsirkin
Browse files

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: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent fd0e21c3

drivers/vhost/vhost.c

+7 −0
Original line number Diff line number Diff line
@@ -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);

drivers/vhost/vhost.h

+1 −0
Original line number Diff line number Diff line
@@ -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);