xen: update ring.h

Update include/xen/interface/io/ring.h to its newest version.

Switch the two improper use cases of RING_HAS_UNCONSUMED_RESPONSES() to
XEN_RING_NR_UNCONSUMED_RESPONSES() in order to avoid the nasty
XEN_RING_HAS_UNCONSUMED_IS_BOOL #define.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index af3d3de7d9fa6a2e9d5d1ea2292e7d7fba7893fb..966bee2a6902d019e1dbf1e7605c6e6ea9ee5aca 100644 (file)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -866,7 +866,7 @@ static void xennet_set_rx_rsp_cons(struct netfront_queue *queue, RING_IDX val)
 
        spin_lock_irqsave(&queue->rx_cons_lock, flags);
        queue->rx.rsp_cons = val;
-       queue->rx_rsp_unconsumed = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx);
+       queue->rx_rsp_unconsumed = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx);
        spin_unlock_irqrestore(&queue->rx_cons_lock, flags);
 }
 
@@ -1498,7 +1498,7 @@ static bool xennet_handle_rx(struct netfront_queue *queue, unsigned int *eoi)
                return false;
 
        spin_lock_irqsave(&queue->rx_cons_lock, flags);
-       work_queued = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx);
+       work_queued = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx);
        if (work_queued > queue->rx_rsp_unconsumed) {
                queue->rx_rsp_unconsumed = work_queued;
                *eoi = 0;

diff --git a/include/xen/interface/io/ring.h b/include/xen/interface/io/ring.h
index 2470ec45ebb20282f10d0d77728ef454166d81a7..ba4c4274b7146ed496629318a100152a1bd938c1 100644 (file)
--- a/include/xen/interface/io/ring.h
+++ b/include/xen/interface/io/ring.h
@@ -72,9 +72,8 @@ typedef unsigned int RING_IDX;
  * of the shared memory area (PAGE_SIZE, for instance). To initialise
  * the front half:
  *
- *     mytag_front_ring_t front_ring;
- *     SHARED_RING_INIT((mytag_sring_t *)shared_page);
- *     FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
+ *     mytag_front_ring_t ring;
+ *     XEN_FRONT_RING_INIT(&ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
  *
  * Initializing the back follows similarly (note that only the front
  * initializes the shared ring):
@@ -146,6 +145,11 @@ struct __name##_back_ring {                                             \
 
 #define FRONT_RING_INIT(_r, _s, __size) FRONT_RING_ATTACH(_r, _s, 0, __size)
 
+#define XEN_FRONT_RING_INIT(r, s, size) do {                            \
+    SHARED_RING_INIT(s);                                                \
+    FRONT_RING_INIT(r, s, size);                                        \
+} while (0)
+
 #define BACK_RING_ATTACH(_r, _s, _i, __size) do {                       \
     (_r)->rsp_prod_pvt = (_i);                                          \
     (_r)->req_cons = (_i);                                              \
@@ -170,16 +174,21 @@ struct __name##_back_ring {                                             \
     (RING_FREE_REQUESTS(_r) == 0)
 
 /* Test if there are outstanding messages to be processed on a ring. */
-#define RING_HAS_UNCONSUMED_RESPONSES(_r)                               \
+#define XEN_RING_NR_UNCONSUMED_RESPONSES(_r)                            \
     ((_r)->sring->rsp_prod - (_r)->rsp_cons)
 
-#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({                             \
+#define XEN_RING_NR_UNCONSUMED_REQUESTS(_r) ({                          \
     unsigned int req = (_r)->sring->req_prod - (_r)->req_cons;          \
     unsigned int rsp = RING_SIZE(_r) -                                  \
         ((_r)->req_cons - (_r)->rsp_prod_pvt);                          \
     req < rsp ? req : rsp;                                              \
 })
 
+#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
+    (!!XEN_RING_NR_UNCONSUMED_RESPONSES(_r))
+#define RING_HAS_UNCONSUMED_REQUESTS(_r)  \
+    (!!XEN_RING_NR_UNCONSUMED_REQUESTS(_r))
+
 /* Direct access to individual ring elements, by index. */
 #define RING_GET_REQUEST(_r, _idx)                                      \
     (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))