mm/kmemleak: move the initialisation of object to __link_object

In patch (mm: kmemleak: split __create_object into two functions), the
initialisation of object has been splited in two places.  Catalin said it
feels a bit weird and error prone.  So leave __alloc_object() to just do
the actual allocation and let __link_object() do the full initialisation.

Link: https://lkml.kernel.org/r/20231023025125.90972-1-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Liu Shixin

mm/kmemleak.c

@@ -642,16 +642,32 @@ static struct kmemleak_object *__alloc_object(gfp_t gfp)
 	if (!object) {
 		pr_warn("Cannot allocate a kmemleak_object structure\n");
 		kmemleak_disable();
-		return NULL;
 	}
 
+	return object;
+}
+
+static int __link_object(struct kmemleak_object *object, unsigned long ptr,
+			 size_t size, int min_count, bool is_phys)
+{
+
+	struct kmemleak_object *parent;
+	struct rb_node **link, *rb_parent;
+	unsigned long untagged_ptr;
+	unsigned long untagged_objp;
+
 	INIT_LIST_HEAD(&object->object_list);
 	INIT_LIST_HEAD(&object->gray_list);
 	INIT_HLIST_HEAD(&object->area_list);
 	raw_spin_lock_init(&object->lock);
 	atomic_set(&object->use_count, 1);
+	object->flags = OBJECT_ALLOCATED | (is_phys ? OBJECT_PHYS : 0);
+	object->pointer = ptr;
+	object->size = kfence_ksize((void *)ptr) ?: size;
 	object->excess_ref = 0;
+	object->min_count = min_count;
 	object->count = 0;			/* white color initially */
+	object->jiffies = jiffies;
 	object->checksum = 0;
 	object->del_state = 0;
 
@@ -676,24 +692,6 @@ static struct kmemleak_object *__alloc_object(gfp_t gfp)
 	/* kernel backtrace */
 	object->trace_handle = set_track_prepare();
 
-	return object;
-}
-
-static int __link_object(struct kmemleak_object *object, unsigned long ptr,
-			 size_t size, int min_count, bool is_phys)
-{
-
-	struct kmemleak_object *parent;
-	struct rb_node **link, *rb_parent;
-	unsigned long untagged_ptr;
-	unsigned long untagged_objp;
-
-	object->flags = OBJECT_ALLOCATED | (is_phys ? OBJECT_PHYS : 0);
-	object->pointer = ptr;
-	object->size = kfence_ksize((void *)ptr) ?: size;
-	object->min_count = min_count;
-	object->jiffies = jiffies;
-
 	untagged_ptr = (unsigned long)kasan_reset_tag((void *)ptr);
 	/*
 	 * Only update min_addr and max_addr with object