csky: use free_initmem_default() in free_initmem()

The existing code is essentially
free_initmem_default()->free_reserved_area() without poisoning.

Note that existing code missed to update the managed page count of the
zone.

Cc: Andrew Morton <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Wei Yang <[email protected]>
Tested-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>

Author: davidhildenbrand

arch/csky/mm/init.c

@@ -110,24 +110,9 @@ void __init mem_init(void)
 	mem_init_print_info(NULL);
 }
 
-extern char __init_begin[], __init_end[];
-
 void free_initmem(void)
 {
-	unsigned long addr;
-
-	addr = (unsigned long) &__init_begin;
-
-	while (addr < (unsigned long) &__init_end) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
-		free_page(addr);
-		totalram_pages_inc();
-		addr += PAGE_SIZE;
-	}
-
-	pr_info("Freeing unused kernel memory: %dk freed\n",
-	((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
+	free_initmem_default(-1);
 }
 
 void pgd_init(unsigned long *p)