sh: use PFN_DOWN macro

Replace ((x) >> PAGE_SHIFT) with the predefined PFN_DOWN macro.
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/sh/mm/init.c

@@ -488,7 +488,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 int arch_add_memory(int nid, u64 start, u64 size)
 {
 	pg_data_t *pgdat;
-	unsigned long start_pfn = start >> PAGE_SHIFT;
+	unsigned long start_pfn = PFN_DOWN(start);
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 	int ret;
 
@@ -517,7 +517,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #ifdef CONFIG_MEMORY_HOTREMOVE
 int arch_remove_memory(u64 start, u64 size)
 {
-	unsigned long start_pfn = start >> PAGE_SHIFT;
+	unsigned long start_pfn = PFN_DOWN(start);
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 	struct zone *zone;
 	int ret;

arch/sh/mm/numa.c

@@ -33,8 +33,8 @@ void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
 	/* Don't allow bogus node assignment */
 	BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
 
-	start_pfn = start >> PAGE_SHIFT;
-	end_pfn = end >> PAGE_SHIFT;
+	start_pfn = PFN_DOWN(start);
+	end_pfn = PFN_DOWN(end);
 
 	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 			 PAGE_KERNEL);