linux-kernel - [DEBUG 02/10] powerpc/mm: Create numa nodes for hotplug memory

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Date:   Mon, 24 Oct 2016 10:12:21 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, js1304@...il.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, akpm@...ux-foundation.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com
Subject: [DEBUG 02/10] powerpc/mm: Create numa nodes for hotplug memory

From: Reza Arbab <arbab@...ux.vnet.ibm.com>

When scanning the device tree to initialize the system NUMA topology,
process dt elements with compatible id "ibm,hotplug-aperture" to create
memoryless numa nodes.

These nodes will be filled when hotplug occurs within the associated
address range.

Signed-off-by: Reza Arbab <arbab@...ux.vnet.ibm.com>
Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/mm/numa.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index a51c188..42fcc8e 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -708,6 +708,12 @@ static void __init parse_drconf_memory(struct device_node *memory)
 	}
 }
 
+static const struct of_device_id memory_match[] = {
+	{ .type = "memory" },
+	{ .compatible = "ibm,hotplug-aperture" },
+	{ /* sentinel */ }
+};
+
 static int __init parse_numa_properties(void)
 {
 	struct device_node *memory;
@@ -752,7 +758,7 @@ static int __init parse_numa_properties(void)
 
 	get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
 
-	for_each_node_by_type(memory, "memory") {
+	for_each_matching_node(memory, memory_match) {
 		unsigned long start;
 		unsigned long size;
 		int nid;
@@ -1044,7 +1050,7 @@ static int hot_add_node_scn_to_nid(unsigned long scn_addr)
 	struct device_node *memory;
 	int nid = -1;
 
-	for_each_node_by_type(memory, "memory") {
+	for_each_matching_node(memory, memory_match) {
 		unsigned long start, size;
 		int ranges;
 		const __be32 *memcell_buf;
-- 
2.1.0