Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S932732AbdCaDu0 (ORCPT <rfc822;w@1wt.eu>);
        Thu, 30 Mar 2017 23:50:26 -0400
Received: from out0-236.mail.aliyun.com ([140.205.0.236]:42134 "EHLO
        out0-236.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S932525AbdCaDuY (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 30 Mar 2017 23:50:24 -0400
X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R781e4;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e02c03278;MF=hillf.zj@alibaba-inc.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---.7t4GW-o_1490932189;
Reply-To: "Hillf Danton" <hillf.zj@alibaba-inc.com>
From: "Hillf Danton" <hillf.zj@alibaba-inc.com>
To: "'Michal Hocko'" <mhocko@kernel.org>, <linux-mm@kvack.org>
Cc: "'Andrew Morton'" <akpm@linux-foundation.org>,
        "'Mel Gorman'" <mgorman@suse.de>, "'Vlastimil Babka'" <vbabka@suse.cz>,
        "'Andrea Arcangeli'" <aarcange@redhat.com>,
        "'Reza Arbab'" <arbab@linux.vnet.ibm.com>,
        "'Yasuaki Ishimatsu'" <yasu.isimatu@gmail.com>,
        "'Tang Chen'" <tangchen@cn.fujitsu.com>, <qiuxishi@huawei.com>,
        "'Kani Toshimitsu'" <toshi.kani@hpe.com>, <slaoub@gmail.com>,
        "'Joonsoo Kim'" <js1304@gmail.com>,
        "'Andi Kleen'" <ak@linux.intel.com>,
        "'Zhang Zhen'" <zhenzhang.zhang@huawei.com>,
        "'David Rientjes'" <rientjes@google.com>,
        "'Daniel Kiper'" <daniel.kiper@oracle.com>,
        "'Igor Mammedov'" <imammedo@redhat.com>,
        "'Vitaly Kuznetsov'" <vkuznets@redhat.com>,
        "'LKML'" <linux-kernel@vger.kernel.org>,
        "'Michal Hocko'" <mhocko@suse.com>
References: <20170330115454.32154-1-mhocko@kernel.org> <20170330115454.32154-4-mhocko@kernel.org>
In-Reply-To: <20170330115454.32154-4-mhocko@kernel.org>
Subject: Re: [PATCH 3/6] mm: remove return value from init_currently_empty_zone
Date: Fri, 31 Mar 2017 11:49:49 +0800
Message-ID: <04ad01d2a9d1$d99b0540$8cd10fc0$@alibaba-inc.com>
MIME-Version: 1.0
Content-Type: text/plain;
        charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Outlook 14.0
Thread-Index: AQFU6y+5EAZL2+8hDBYbLS7ZosefXwEgoNBToqDG58A=
Content-Language: zh-cn
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 932
Lines: 28

On March 30, 2017 7:55 PM Michal Hocko wrote: 
> 
> From: Michal Hocko <mhocko@suse.com>
> 
> init_currently_empty_zone doesn't have any error to return yet it is
> still an int and callers try to be defensive and try to handle potential
> error. Remove this nonsense and simplify all callers.
> 
It is already cut off in 1/6 in this series?

<snip>

> -/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
> - * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */
> -static int __ref ensure_zone_is_initialized(struct zone *zone,
> +static void __ref ensure_zone_is_initialized(struct zone *zone,
>  			unsigned long start_pfn, unsigned long num_pages)
>  {
> -	if (zone_is_empty(zone))
> -		return init_currently_empty_zone(zone, start_pfn, num_pages);
> -
> -	return 0;
> +	if (!zone_is_empty(zone))
> +		init_currently_empty_zone(zone, start_pfn, num_pages);
>  }
Semantic change added?

Hillf