provide a single, common implementation for get_order_from_{bytes,pages}()

All three per-architecture implementations were identical, and I cannot
see how future architectures would need any sort of customization here
(the only per-architecture aspect here is the actual PAGE_SHIFT value).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 94e7d42a8e..11381a1303 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -318,6 +318,28 @@ page_list_splice(struct page_list_head *list, struct page_list_head *head)
 # define page_list_splice(list, hd)        list_splice(list, hd)
 #endif
 
+static inline unsigned int get_order_from_bytes(paddr_t size)
+{
+    unsigned int order;
+
+    size = (size - 1) >> PAGE_SHIFT;
+    for ( order = 0; size; order++ )
+        size >>= 1;
+
+    return order;
+}
+
+static inline unsigned int get_order_from_pages(unsigned long nr_pages)
+{
+    unsigned int order;
+
+    nr_pages--;
+    for ( order = 0; nr_pages; order++ )
+        nr_pages >>= 1;
+
+    return order;
+}
+
 void scrub_one_page(struct page_info *);
 
 /* Returns 1 on success, 0 on error, negative if the ring