linux-kernel - [07/74] x86: Set hotpluggable nodes in nodes_possible

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Message-Id: <20100204171450.450060042@linux.site>
Date:	Thu, 04 Feb 2010 09:11:38 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	David Rientjes <rientjes@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [07/74] x86: Set hotpluggable nodes in nodes_possible_map

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: David Rientjes <rientjes@...gle.com>

commit 3a5fc0e40cb467e692737bc798bc99773c81e1e2 upstream.

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.

[ hpa: Haicheng Li points out that this makes the naming of the
  variable cpu_nodes_parsed somewhat counterintuitive.  However, leave
  it as is in the interest of keeping the pure bug fix patch small. ]

Signed-off-by: David Rientjes <rientjes@...gle.com>
Tested-by: Haicheng Li <haicheng.li@...ux.intel.com>
LKML-Reference: <alpine.DEB.2.00.1001201152040.30528@...no.kir.corp.google.com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/mm/srat_64.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 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
 			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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