ARM: provide phys_to_page() to complement page_to_phys()

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Tested-By: NJamie Iles <jamie@jamieiles.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm/include/asm/memory.h

@@ -134,6 +134,12 @@
 #define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)
 #define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)
 
+/*
+ * Convert a page to/from a physical address
+ */
+#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
+#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))
+
 #ifndef __ASSEMBLY__
 
 /*
@@ -292,11 +298,6 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
 
 #endif /* !CONFIG_DISCONTIGMEM */
 
-/*
- * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
- */
-#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
-
 /*
  * Optional coherency support.  Currently used only by selected
  * Intel XSC3-based systems.