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

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Date:   Wed, 31 Aug 2016 20:57:29 -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 05:28:26PM -0700, David Rientjes wrote:
>> 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.
>
>Yes, absolutely.  It returning -EINVAL for "nline" is what is accidently
>preserving it's backwards compatibility :)  Note that device_online()
>returns 1 if already online and memory_subsys_online() returns 0 if online
>in this case.  So we want store_mem_state() to return -EINVAL if
>device_online() returns non-zero (this was in my first email).

I'll spin a v3 patch to do this.

Thank you for your review!

-- 
Reza Arbab