linux-kernel - [patch] x86: set hotpluggable nodes in nodes_possible

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Date:	Wed, 20 Jan 2010 12:10:47 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Haicheng Li <haicheng.li@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>
cc:	Yinghai Lu <yinghai@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: [patch] x86: set hotpluggable nodes in nodes_possible_map

On Thu, 21 Jan 2010, Haicheng Li wrote:

> let's add more changes to fix naming issue as well since it's too confusing
> for people to understand
> the code logic. how about below patch?

That should be a seperate change; there's a bugfix here (my patch) and 
then a cleanup patch that you could make incrementally on mine.  I don't 
personally like the name "rest_nodes_parsed" since it's poor English, I 
suggest renaming nodes_parsed to mem_nodes_parsed as I originally asked 
and then cpu_nodes_parsed to acpi_nodes_parsed or something similiar.

Ingo, the following is my bugfix patch that addresses the issue at 
http://patchwork.kernel.org/patch/69499.  Haicheng, can we add your 
tested-by line?

x86: set hotpluggable nodes in nodes_possible_map

nodes_possible_map does not currently include nodes that have SRAT
entries that are all ACPI_SRAT_MEM_HOT_PLUGGABLE since the bit is cleared
in nodes_parsed if it does not have an online address range.

Unequivocally setting the bit in nodes_parsed is insufficient since
existing code, such as acpi_get_nodes(), assumes all nodes in the map
have online address ranges.  In fact, all code using nodes_parsed assumes
such nodes represent an address range of online memory.

nodes_possible_map is created by unioning nodes_parsed and
cpu_nodes_parsed; the former represents nodes with online memory and the
latter represents memoryless nodes.  We now set the bit for hotpluggable
nodes in cpu_nodes_parsed so that it also gets set in nodes_possible_map.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 arch/x86/mm/srat_64.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -229,9 +229,11 @@ update_nodes_add(int node, unsigned long start, unsigned long end)
 			printk(KERN_ERR "SRAT: Hotplug zone not continuous. Partly ignored\n");
 	}

-	if (changed)
+	if (changed) {
+		node_set(node, cpu_nodes_parsed);
 		printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n",
 				 nd->start, nd->end);
+	}
 }

 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
--
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