linux-kernel - Re: [PATCH 3/3] x86_64: offset apicid_to_node before use it before init_cpu_to

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Date:	Sun, 22 Jul 2007 01:17:06 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"David Rientjes" <rientjes@...gle.com>
Cc:	"Andi Kleen" <ak@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] x86_64: offset apicid_to_node before use it before init_cpu_to_node

On 7/22/07, David Rientjes <rientjes@...gle.com> wrote:
> On Sat, 21 Jul 2007, Yinghai Lu wrote:
>
> > [PATCH 3/3] x86_64: offset apicid_to_node before use it before
> > init_cpu_to_node
> >
>
> Does this preserve the correct fake apicid_to_node mapping for the
> emulated case such as numa=fake=32?
>
+void __init update_apicid_to_node(void)
+{
+       /*
+        * let modify apicid_to_node array when boot_cpu_id !=0
+        * apicid_to_node[0] != NUMA_NODE
+        */
+
+       int i;
+
+       /* there is no apic id offset */
+       if (!boot_cpu_id)
+               return;
+
+       /* check if it is already updated */
+       if (apicid_to_node[0] == NUMA_NO_NODE)
+               return;

boot_cpu_id (bsp apic id ) is 0 under fake numa case?

or need to add some exit for fake numa mode.

YH
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