xen: add page_to_mfn()

pfn_to_mfn(page_to_pfn(p)) is a common use case so add a generic
helper for it.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/xen/page.h b/include/xen/page.h
index 12765b6..c5ed20b 100644 (file)
--- a/include/xen/page.h
+++ b/include/xen/page.h
@@ -3,6 +3,11 @@
 
 #include <asm/xen/page.h>
 
+static inline unsigned long page_to_mfn(struct page *page)
+{
+       return pfn_to_mfn(page_to_pfn(page));
+}
+
 struct xen_memory_region {
        phys_addr_t start;
        phys_addr_t size;