[PATCH v2 1/2] usbif.h: replace PAGE_SIZE with USBIF_RING_SIZE

[Stefano Stabellini <sstabellini@kernel.org>]

Do not reference PAGE_SIZE directly: it could be undefined, or it could
have different values in the frontend or in the backend.

Define USBIF_RING_SIZE as 4096, assuming all users of usbif.h have 4K
page granularity. Replace PAGE_SIZE with USBIF_RING_SIZE.

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
---
 xen/include/public/io/usbif.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/include/public/io/usbif.h b/xen/include/public/io/usbif.h
index 4053c24..c6a5863 100644
--- a/xen/include/public/io/usbif.h
+++ b/xen/include/public/io/usbif.h
@@ -170,6 +170,7 @@ enum usb_spec_version {
 
 #define USBIF_MAX_SEGMENTS_PER_REQUEST (16)
 #define USBIF_MAX_PORTNR	31
+#define USBIF_RING_SIZE	4096
 
 /*
  * RING for transferring urbs.
@@ -226,7 +227,7 @@ struct usbif_urb_response {
 typedef struct usbif_urb_response usbif_urb_response_t;
 
 DEFINE_RING_TYPES(usbif_urb, struct usbif_urb_request, struct usbif_urb_response);
-#define USB_URB_RING_SIZE __CONST_RING_SIZE(usbif_urb, PAGE_SIZE)
+#define USB_URB_RING_SIZE __CONST_RING_SIZE(usbif_urb, USBIF_RING_SIZE)
 
 /*
  * RING for notifying connect/disconnect events to frontend
@@ -248,6 +249,6 @@ struct usbif_conn_response {
 typedef struct usbif_conn_response usbif_conn_response_t;
 
 DEFINE_RING_TYPES(usbif_conn, struct usbif_conn_request, struct usbif_conn_response);
-#define USB_CONN_RING_SIZE __CONST_RING_SIZE(usbif_conn, PAGE_SIZE)
+#define USB_CONN_RING_SIZE __CONST_RING_SIZE(usbif_conn, USBIF_RING_SIZE)
 
 #endif /* __XEN_PUBLIC_IO_USBIF_H__ */
-- 
1.9.1


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