x86/mm: export get_page_from_mfn

It will be used later in multiple files.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/mm.c

@@ -706,22 +706,6 @@ bool map_ldt_shadow_page(unsigned int offset)
     return true;
 }
 
-
-static bool get_page_from_mfn(mfn_t mfn, struct domain *d)
-{
-    struct page_info *page = mfn_to_page(mfn);
-
-    if ( unlikely(!mfn_valid(mfn)) || unlikely(!get_page(page, d)) )
-    {
-        gdprintk(XENLOG_WARNING,
-                 "Could not get page ref for mfn %"PRI_mfn"\n", mfn_x(mfn));
-        return false;
-    }
-
-    return true;
-}
-
-
 static int get_page_and_type_from_mfn(
     mfn_t mfn, unsigned long type, struct domain *d,
     int partial, int preemptible)

xen/include/asm-x86/mm.h

@@ -369,6 +369,20 @@ int  get_page_from_l1e(
     l1_pgentry_t l1e, struct domain *l1e_owner, struct domain *pg_owner);
 void put_page_from_l1e(l1_pgentry_t l1e, struct domain *l1e_owner);
 
+static inline bool get_page_from_mfn(mfn_t mfn, struct domain *d)
+{
+    struct page_info *page = __mfn_to_page(mfn_x(mfn));
+
+    if ( unlikely(!mfn_valid(mfn)) || unlikely(!get_page(page, d)) )
+    {
+        gdprintk(XENLOG_WARNING,
+                 "Could not get page ref for mfn %"PRI_mfn"\n", mfn_x(mfn));
+        return false;
+    }
+
+    return true;
+}
+
 static inline void put_page_and_type(struct page_info *page)
 {
     put_page_type(page);