linux-kernel - Re: [RFC] hotplug, memory: move register_memory_resource out of the lock_memory

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Message-ID: <alpine.DEB.2.02.1401141702450.3375@chino.kir.corp.google.com>
Date:	Tue, 14 Jan 2014 17:05:42 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Nathan Zimmer <nzimmer@....com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Hedi <hedi@....com>, Mike Travis <travis@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] hotplug, memory: move register_memory_resource out of the
 lock_memory_hotplug

On Tue, 14 Jan 2014, Andrew Morton wrote:

> From: Andrew Morton <akpm@...ux-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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