linux-kernel - Re: [PATCH] x86_64 - UV fix for memory-only blades

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Date:	Tue, 19 May 2009 08:13:05 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jack Steiner <steiner@....com>
CC:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64 - UV fix for memory-only blades

Jack Steiner wrote:
> Fix an endcase in handling UV blades that have memory
> but no cpus. The calculation of the highest blade number
> failed to handle these blades if they appear last in the
> configuration.
> 
> Signed-off-by: Jack Steiner <steiner@....com>
> 
> ---
>  arch/x86/kernel/apic/x2apic_uv_x.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2009-05-15 12:00:59.000000000 -0500
> +++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2009-05-15 14:38:16.000000000 -0500
> @@ -632,6 +632,7 @@ void __init uv_system_init(void)
>  		pnode = (paddr >> m_val) & pnode_mask;
>  		blade = boot_pnode_to_blade(pnode);
>  		uv_node_to_blade[nid] = blade;
> +		max_pnode = max(pnode, max_pnode);
>  	}
>  
>  	map_gru_high(max_pnode);

node_possible_map should already include nodes with memory and without memory already.

maybe you could skip max_pnode calculating in the loop.

YH
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