From 8c2676a5870ab15cbeea9f826266bc946fe3cc26 Mon Sep 17 00:00:00 2001
From: Keith Mannthey <kmannth@us.ibm.com>
Date: Sat, 30 Sep 2006 23:27:07 -0700
Subject: [PATCH] [PATCH] hot-add-mem x86_64: memory_add_physaddr_to_nid node
 fixup

In cases where the acpi memory-add event does not containe the pxm (node)
infomation allow the driver to look up node info based on the address.  The
acpi_get_node call returns -1 if it can't decode the pxm info, this causes
add_memory to panic.  acpi_get_node would have to decode the resource from the
handle (a lenghty proposition).  This seems to be the cleanist point to
interject the hook.

[kamezawa.hiroyu@jp.fujitsu.com: build fixes]
[y-goto@jp.fujitsu.com: build fixes]
Signed-off-by: Keith Mannthey <kmannth@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/ia64/mm/numa.c            | 18 ++++++++++++++++++
 arch/x86_64/mm/init.c          |  1 +
 arch/x86_64/mm/srat.c          |  2 ++
 drivers/acpi/acpi_memhotplug.c |  4 ++++
 4 files changed, 25 insertions(+)

diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c
index 64e4c21f311c..7807fc5c0422 100644
--- a/arch/ia64/mm/numa.c
+++ b/arch/ia64/mm/numa.c
@@ -16,6 +16,7 @@
 #include <linux/node.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>
+#include <linux/module.h>
 #include <asm/mmzone.h>
 #include <asm/numa.h>
 
@@ -69,4 +70,21 @@ int early_pfn_to_nid(unsigned long pfn)
 
 	return 0;
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ *  SRAT information is stored in node_memblk[], then we can use SRAT
+ *  information at memory-hot-add if necessary.
+ */
+
+int memory_add_physaddr_to_nid(u64 addr)
+{
+	int nid = paddr_to_nid(addr);
+	if (nid < 0)
+		return 0;
+	return nid;
+}
+
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
 #endif
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index e759109abb36..71ecbb3f3262 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -498,6 +498,7 @@ int memory_add_physaddr_to_nid(u64 start)
 {
 	return 0;
 }
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
 
 #else /* CONFIG_MEMORY_HOTPLUG */
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 8491300ef909..3cc0544e25f5 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -477,3 +477,5 @@ int memory_add_physaddr_to_nid(u64 start)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 1dda370f402b..98099de59b45 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -238,6 +238,10 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 			num_enabled++;
 			continue;
 		}
+
+		if (node < 0)
+			node = memory_add_physaddr_to_nid(info->start_addr);
+
 		result = add_memory(node, info->start_addr, info->length);
 		if (result)
 			continue;