Since commit 43c95bcc ("mm/page_alloc: reduce duration that IRQs are
disabled for VM counters"), zone_statistics() is not called with
interrupts disabled.  Update the corresponding comment.

Link: https://lkml.kernel.org/r/20220916072257.9639-5-linmiaohe@huawei.comSigned-off-by: NMiaohe Lin <linmiaohe@huawei.com>
Acked-by: NDavid Hildenbrand <david@redhat.com>
Reviewed-by: NAnshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: NOscar Salvador <osalvador@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>