m68k/coldfire: use PFN_DOWN macro

Replace ((x) >> PAGE_SHIFT) with the predefined PFN_DOWN macro.
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/coldfire/m54xx.c

@@ -25,6 +25,7 @@
 #include <asm/m54xxgpt.h>
 #ifdef CONFIG_MMU
 #include <asm/mmu_context.h>
+#include <linux/pfn.h>
 #endif
 
 /***************************************************************************/
@@ -91,13 +92,13 @@ static void __init mcf54xx_bootmem_alloc(void)
 	m68k_memory[0].size = _ramend - _rambase;
 
 	/* compute total pages in system */
-	num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
+	num_pages = PFN_DOWN(_ramend - _rambase);
 
 	/* page numbers */
 	memstart = PAGE_ALIGN(_ramstart);
-	min_low_pfn = _rambase >> PAGE_SHIFT;
-	start_pfn = memstart >> PAGE_SHIFT;
-	max_low_pfn = _ramend >> PAGE_SHIFT;
+	min_low_pfn = PFN_DOWN(_rambase);
+	start_pfn = PFN_DOWN(memstart);
+	max_low_pfn = PFN_DOWN(_ramend);
 	high_memory = (void *)_ramend;
 
 	m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;