Sparc64: Fix thinko in page_to_pfn

include/asm-sparc64/page.h

@@ -115,7 +115,7 @@ typedef unsigned long iopgprot_t;
 #define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
 
 #define pfn_to_page(pfn)	(mem_map + ((pfn)-(pfn_base)))
-#define page_to_pfn(page)	((unsigned long)((page) - ((pfn)-(pfn_base)) - mem_map))
+#define page_to_pfn(page)	((unsigned long)(((page) - mem_map) + pfn_base))
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 
 #define pfn_valid(pfn)		((pfn) < max_mapnr)