linux-kernel - Re: [PATCH 10/26] x86-64, NUMA: Move apicid to numa mapping initialization from amd_scan_nodes() to amd_numa

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Message-ID: <20110215093631.GG3160@htj.dyndns.org>
Date:	Tue, 15 Feb 2011 10:36:31 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, yinghai@...nel.org,
	brgerst@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
	mingo@...e.hu, hpa@...ux.intel.com
Subject: Re: [PATCH 10/26] x86-64, NUMA: Move apicid to numa mapping
 initialization from amd_scan_nodes() to amd_numa_init()

Hello, Cyrill.

On Tue, Feb 15, 2011 at 01:59:26AM +0300, Cyrill Gorcunov wrote:
> >+	/* get the APIC ID of the BSP early for systems with apicid lifting */
> >+	early_get_boot_cpu_id();
> >+	if (boot_cpu_physical_apicid>  0) {
> >+		pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
> >+		apicid_base = boot_cpu_physical_apicid;
> 		^^^
> >+	}
> >+
> >+	for_each_node_mask(i, cpu_nodes_parsed)
> >+		for (j = apicid_base; j<  cores + apicid_base; j++)
> >+			set_apicid_to_node((i<<  bits) + j, i);
> >+
> >  	return 0;
> >  }
> >
> 
>   Hi Tejun, while you at it, it seems apicid_base conditional assignment is
> redundant here (boot_cpu_physical_apicid is unsigned int) so we might have
> something like
> 
> 	apicid_start	= boot_cpu_physical_apicid;
> 	apicid_end	= apicid_start + cores;
> 
> 	for_each_node_mask(i, cpu_nodes_parsed) {
> 		for (j = apicid_start; j <  apicid_end; j++)
> 			set_apicid_to_node((i <<  bits) + j, i);
> 	}

Right, I think the intention there was

	if (boot_cpu_physical_apicid == -1U)

because that's the initial value and we don't really want to index the
apicid nid table with -1U.  Care to send a patch?  I'm gonna have to
rebase anyway and can put the patch at the front.

Thanks.

-- 
tejun
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