linux-kernel - Re: [RESEND PATCH v2] memory-hotplug: fix store_mem

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Message-Id: <20160901001751.m3z2snlop2djzqgd@arbab-vm>
Date:   Wed, 31 Aug 2016 19:17:51 -0500
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Yaowei Bai <baiyaowei@...s.chinamobile.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Xishi Qiu <qiuxishi@...wei.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Chen Yucong <slaoub@...il.com>,
        Andrew Banman <abanman@....com>,
        Seth Jennings <sjenning@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2] memory-hotplug: fix store_mem_state() return
 value

On Wed, Aug 31, 2016 at 05:03:25PM -0700, David Rientjes wrote:
>Nope, the return value of changing state from online to online was
>established almost 11 years ago in commit 3947be1969a9.

Fair enough. So if online-to-online is -EINVAL, 

1. Shouldn't 'echo 1 > online' then also return -EINVAL?

2. store_mem_state() still needs a tweak, right? It was only returning 
-EINVAL by accident, due to the convoluted sequence I listed in the 
patch.

-- 
Reza Arbab