linux-kernel - Re: [v2,2/8] NUMA Hotplug emulator

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Date:	Mon, 15 Nov 2010 15:41:59 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: [v2,2/8] NUMA Hotplug emulator

On Sat, Nov 13, 2010 at 02:14:45PM +0800, Shaohui Zheng wrote:
> diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
> index dba35e4..ba0f82d 100644
> --- a/include/linux/nodemask.h
> +++ b/include/linux/nodemask.h
> @@ -371,6 +371,10 @@ static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
>   */
>  enum node_states {
>  	N_POSSIBLE,		/* The node could become online at some point */
> +#ifdef CONFIG_NODE_HOTPLUG_EMU
> +	N_HIDDEN,		/* The node is hidden at booting time, could be
> +				 * onlined in run time */
> +#endif
>  	N_ONLINE,		/* The node is online */
>  	N_NORMAL_MEMORY,	/* The node has regular memory */
>  #ifdef CONFIG_HIGHMEM
> @@ -470,6 +474,13 @@ static inline int num_node_state(enum node_states state)
>  #define node_online(node)	node_state((node), N_ONLINE)
>  #define node_possible(node)	node_state((node), N_POSSIBLE)
>  
> +#ifdef CONFIG_NODE_HOTPLUG_EMU
> +#define node_set_hidden(node)	   node_set_state((node), N_HIDDEN)
> +#define node_clear_hidden(node)	   node_clear_state((node), N_HIDDEN)
> +#define node_hidden(node)	node_state((node), N_HIDDEN)
> +extern int hotadd_hidden_nodes(int nid);
> +#endif
> +
>  #define for_each_node(node)	   for_each_node_state(node, N_POSSIBLE)
>  #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
>  
None of these really need to be under ifdef. Secondly, the description
you have provided is pretty ambiguous in comparison to N_POSSIBLE. Is
there some reason you can't just use N_POSSIBLE for this instead?
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