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Date: Tue, 14 Jan 2014 17:05:42 -0800 (PST)
From: David Rientjes <rientjes@google.com>
Subject: Re: [RFC] hotplug, memory: move register_memory_resource out of the
 lock_memory_hotplug
In-Reply-To: <20140114151340.004d25c00056d88f33cadda0@linux-foundation.org>
Message-ID: <alpine.DEB.2.02.1401141702450.3375@chino.kir.corp.google.com>
References: <1389723874-32372-1-git-send-email-nzimmer@sgi.com> <20140114151340.004d25c00056d88f33cadda0@linux-foundation.org>
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To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nathan Zimmer <nzimmer@sgi.com>, Tang Chen <tangchen@cn.fujitsu.com>, Wen Congyang <wency@cn.fujitsu.com>, Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, Hedi <hedi@sgi.com>, Mike Travis <travis@sgi.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

On Tue, 14 Jan 2014, Andrew Morton wrote:

> From: Andrew Morton <akpm@linux-foundation.org>
> Subject: mm/memory_hotplug.c: register_memory_resource() fixes
> 
> - register_memory_resource() should not go BUG on ENOMEM.  That's
>   appropriate at system boot time, but not at memory-hotplug time.  Fix.
> 
> - register_memory_resource()'s caller is incorrectly replacing
>   request_resource()'s -EBUSY with -EEXIST.  Fix this by propagating
>   errors appropriately.
> 

Unfortunately, -EEXIST is a special case return value for both 
acpi_memory_enable_device() and hv_mem_hot_add(), so they would need to be 
modified to agree concurrently with this change.

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