/* rb_set_list_to_head - set a list_head to be pointing to head.  */
static void rb_set_list_to_head(struct ring_buffer_per_cpu *cpu_buffer, struct list_head *list)
/* rb_set_list_to_head - set a list_head to be pointing to head.  */
static void rb_set_list_to_head(struct ring_buffer_per_cpu *cpu_buffer, struct list_head *list)
{
	unsigned long *ptr;
	ptr = (unsigned long *)&list->next;
	*ptr |= RB_PAGE_HEAD;
	*ptr &= ~RB_PAGE_UPDATE;
}