linux-kernel - [PATCH 5/10] hot-add-mem x86_64: memory_add_physaddr_to

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Message-Id: <20060804131415.21401.20437.sendpatchset@localhost.localdomain>
Date:	Fri, 4 Aug 2006 07:14:15 -0600
From:	Keith Mannthey <kmannth@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...l.org, discuss@...-64.org,
	Keith Mannthey <kmannth@...ibm.com>, ak@...e.de,
	lhms-devel@...ts.sourceforge.net, kamezawa.hiroyu@...fujitsu.com
Subject: [PATCH 5/10] hot-add-mem x86_64: memory_add_physaddr_to_nid enable

From: Keith Mannthey <kmannth@...ibm.com>

  The api for hot-add memory already has a construct for finding nodes based on
an address, memory_add_physaddr_to_nid.  This patch allows the fucntion to do 
something besides return 0.  It uses the nodes_add infomation to lookup to node 
info for a hot add event. 

Signed-off-by: Keith Mannthey<kmannth@...ibm.com>
---
 init.c |   20 +++++++-------------
 srat.c |   13 ++++++++++++-
 2 files changed, 19 insertions(+), 14 deletions(-)

diff -urN linux-2.6.17/arch/x86_64/mm/init.c current/arch/x86_64/mm/init.c
--- linux-2.6.17/arch/x86_64/mm/init.c	2006-08-04 01:30:39.000000000 -0400
+++ current/arch/x86_64/mm/init.c	2006-08-04 01:24:04.000000000 -0400
@@ -517,19 +517,6 @@
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 /*
- * XXX: memory_add_physaddr_to_nid() is to find node id from physical address
- *	via probe interface of sysfs. If acpi notifies hot-add event, then it
- *	can tell node id by searching dsdt. But, probe interface doesn't have
- *	node id. So, return 0 as node id at this time.
- */
-#ifdef CONFIG_NUMA
-int memory_add_physaddr_to_nid(u64 start)
-{
-	return 0;
-}
-#endif
-
-/*
  * Memory is added always to NORMAL zone. This means you will never get
  * additional DMA/DMA32 memory.
  */
@@ -560,6 +547,13 @@
 }
 EXPORT_SYMBOL_GPL(remove_memory);
 
+#ifndef CONFIG_ACPI_NUMA
+int memory_add_physaddr_to_nid(u64 start)
+{
+	return 0;
+}
+#endif 
+
 #else /* CONFIG_MEMORY_HOTPLUG */
 /*
  * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance,
diff -urN linux-2.6.17/arch/x86_64/mm/srat.c current/arch/x86_64/mm/srat.c
--- linux-2.6.17/arch/x86_64/mm/srat.c	2006-08-04 01:31:44.000000000 -0400
+++ current/arch/x86_64/mm/srat.c	2006-08-04 01:24:04.000000000 -0400
@@ -25,7 +25,7 @@
 
 static nodemask_t nodes_parsed __initdata;
 static struct bootnode nodes[MAX_NUMNODES] __initdata;
-static struct bootnode nodes_add[MAX_NUMNODES] __initdata;
+static struct bootnode nodes_add[MAX_NUMNODES];
 static int found_add_area __initdata;
 int hotadd_percent __initdata = 0;
 
@@ -457,3 +457,14 @@
 }
 
 EXPORT_SYMBOL(__node_distance);
+
+int memory_add_physaddr_to_nid(u64 start)
+{
+	int i, ret = 0;
+	
+	for_each_node(i) 
+		if (nodes_add[i].start <= start && nodes_add[i].end > start)
+			ret = i;
+
+	return ret;
+}
-
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