mm/shuffle: convert module_param_call to module_param_cb

module_param_call is now completely consistent with module_param_cb, so
there is no need to keep two macros.  Convert module_param_call to
module_param_cb since former is obsolete and latter is more kernel-ish.

Link: https://lkml.kernel.org/r/20220909083947.3595610-1-liushixin2@huawei.comSigned-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Paul Russel <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/shuffle.c

@@ -12,23 +12,22 @@
 DEFINE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
 
 static bool shuffle_param;
-static int shuffle_show(char *buffer, const struct kernel_param *kp)
-{
-	return sprintf(buffer, "%c\n", shuffle_param ? 'Y' : 'N');
-}
 
-static __meminit int shuffle_store(const char *val,
+static __meminit int shuffle_param_set(const char *val,
 		const struct kernel_param *kp)
 {
-	int rc = param_set_bool(val, kp);
-
-	if (rc < 0)
-		return rc;
-	if (shuffle_param)
+	if (param_set_bool(val, kp))
+		return -EINVAL;
+	if (*(bool *)kp->arg)
 		static_branch_enable(&page_alloc_shuffle_key);
 	return 0;
 }
-module_param_call(shuffle, shuffle_store, shuffle_show, &shuffle_param, 0400);
+
+static const struct kernel_param_ops shuffle_param_ops = {
+	.set = shuffle_param_set,
+	.get = param_get_bool,
+};
+module_param_cb(shuffle, &shuffle_param_ops, &shuffle_param, 0400);
 
 /*
  * For two pages to be swapped in the shuffle, they must be free (on a