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 <akpm@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
Signed-off-by: David Hildenbrand <david@redhat.com>

diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index 81e4e5e..894050a 100644 (file)
--- a/arch/csky/mm/init.c
+++ b/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)