#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
-#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
-#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+#define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr))
+#define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
#ifndef page_to_phys
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)