linux-kernel - Re: [patch v2 3/6] mm/memory_hotplug: Disable memory hotremove for 32bit

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Message-ID: <20130526090054.GE10651@dhcp22.suse.cz>
Date:	Sun, 26 May 2013 11:00:54 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Tang Chen <tangchen@...fujitsu.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org
Subject: Re: [patch v2 3/6] mm/memory_hotplug: Disable memory hotremove for
 32bit

On Sun 26-05-13 13:58:38, Wanpeng Li wrote:
> As KOSAKI Motohiro mentioned, memory hotplug don't support 32bit since 
> it was born, 

Why? any reference? This reasoning is really weak.

> this patch disable memory hotremove when 32bit at compile 
> time.
> 
> Suggested-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> ---
>  mm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index e742d06..ada9569 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -184,6 +184,7 @@ config MEMORY_HOTREMOVE
>  	bool "Allow for memory hot remove"
>  	select MEMORY_ISOLATION
>  	select HAVE_BOOTMEM_INFO_NODE if X86_64
> +	depends on 64BIT
>  	depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
>  	depends on MIGRATION
>  
> -- 
> 1.8.1.2
> 

-- 
Michal Hocko
SUSE Labs
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