mm/hwpoison: add __init/__exit annotations to module init/exit funcs

Add missing __init/__exit annotations to module init/exit funcs.

Link: https://lkml.kernel.org/r/20220906093530.243262-1-xiujianfeng@huawei.comSigned-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/hwpoison-inject.c

@@ -63,13 +63,13 @@ static int hwpoison_unpoison(void *data, u64 val)
 DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
 DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
 
-static void pfn_inject_exit(void)
+static void __exit pfn_inject_exit(void)
 {
 	hwpoison_filter_enable = 0;
 	debugfs_remove_recursive(hwpoison_dir);
 }
 
-static int pfn_inject_init(void)
+static int __init pfn_inject_init(void)
 {
 	hwpoison_dir = debugfs_create_dir("hwpoison", NULL);