static void *prev_buffer_end_page(struct binder_buffer *buffer)
{
	return (void *)(((uintptr_t)(buffer->data) - 1) & PAGE_MASK);
}
static void *prev_buffer_end_page(struct binder_buffer *buffer)
{
	return (void *)(((uintptr_t)(buffer->data) - 1) & PAGE_MASK);
}